Reign of Gaming

I doubt that Stonewall will answer you so I will.

Trundle is total niche. There is no reason to pick him in SQ. However in Team Queue he can fit very well to many compositions. He just need teamwork to be good.

Sejuani now is better pick, but not the best. She has AoE Ranged 2sec stun which is nice engage/counter engage tool, but besides she's not good overall. Slow early clearing, moderate pre6 ganks, moderate early/mid game dmg, very good lategame. She can fit very well to high dmg low cc comps.

Which one is best pick to win? Jarvan IV. Xin Zhao. Vi. They have hard cc too, slows, much higher damage potential and armor penetration. In particular Jarvan - his ult is just op, free stats, %hit damage, 1,5 sec knockup every 10 sec or so and awesome damage. He has nearly same tools as Sejuani, but better. So in my opinion to win is better to pick Jarvan over Sejuani, but she's not bad and can win too. Some comps are better for Sejuani than for Jarvan, she can fit everywhere where damage is.Trundle is too team relevant and SQ is place when you're punished for teamplay. He's not good pick on SQ. 

I didn't mean that you can't buy single wards, but buying more wards at once saves you money. Imo wards should have more influence in team fights. It's not that they don't do much, but it's passive. Support players without CC bot champs don't have visible influence in teamfights. Giving them area boosts or various negative effects through wards would be great. Every buff ward should have proper counterplay which is not vision ward or oracle.

Imo green wards should be in packs of 3 for 200g. Additionally there can be more types of wards, for example Ping Ward - pings when enemy is in sight, Turtle Ward - when damaged it hides for 30sec and becomes untargetable, but not revealing map while hidden, Elder Ward - has 500hp, lasts 6 minutes and costs much more gold (400 or something), Dark Ward - has lower range, but enemies within has their vision reduced (between Nocturne's ult and normal vision), also all wards in range become useless, Battle Ward - reduces armor and mr of enemy champions, increases armor and mr of allies and whenever allied champion attacks enemy champion in range of this ward, it becomes revealed for 1-3 sec. Also Claviorance could be more like ward that can be put on entire map for around 30 sec (with 1 min CV cooldown)

It'll be both. New map will support matchmaking system and you can also play it on customs.

You know, even if the item is gold efficient it does not mean it's good in every case. I agree that it's good on certain champs like Irelia, maybe Jax and Kog and some others, but it doesn't mean it should be bought on everyone. Look at the Muramana. It's worth 4020g without champions base stats and active. Fully stacked it gives you 40 ad alone for 2100g. With champions' base stats it gives 50-70 AD total, with items like Frozen Hearth or Iceborn Gauntlet it becomes even more efficient. But people don't buy it. They'll rather spend $ for raw stats, not combined items. Not many chars need so much mana. Same with Zephyr. 20 AD is too low, 50% AS is too high, 10% AS - boots are cheaper, tenacity? Nope, mercs are better. Not always buying everything in 1 item is good. That's why I don't like new MR items. HP, Armor, passives, CDR, and then MR. I'd rather buy 1 item, something like Thormail with MR.

It is NOT perfectly fine. There are many champions that are OP or good at least, but don't fit the meta (Poppy, Nasus, Veigar, Rammus). These champions were intended to do something special, not fulfil the meta. In my opinion Poppy has the most op kit in game. Physical to Magic Damage with AA reset, free AD and Armor with mini ghost, gap closer with knockback + stun, 8 seconds of immortality (Kayle ult can be annoying with only 3 sec duration without cc reduction) with damage amplification. And at the top of it - passive. 50% less dmg taken. Alistar's ult all the time. But... she just doesn't fit the meta. She's not good jungler, she sucks at lasthitting, she has op late. Nearly all of the late game champs are useless in this meta. Why? Because meta sucks.   

AD carry/AS bruiser item working on AP carries and full tanks? Ye ofc that was intended.

Yes, it's the part of it, but the point is that noone has built enough HP for it to be cost efficient. In the current meta they would be as OP as the BotRK.

BotRK is op on everyone. I'm building BotRK on Cho, Graves, Jax, even on Skarner. It gives you %damage, flat damage, AS, LS and cool active. Btw Bloodrazors weren't UP, they were just too expensive and niche item.

Meta is so toxic to this game. It's "dictated" by professional players. The goal is to win the game, not to have AD carry, AP carry, Jungler, Support and Solo Top Bruiser. It's like a bomb - if Riot will try to make any changes it may explode. Everything that people know will be gone. In the other side if they'll make as many options as they can available without making old things worse they'll make the game so much better . Imagine that people are using every combination of champions and succeeding at it. Things like AD carry mid, double bruiser bot, double jungle, double mid, snowballing jungle, no jungle at all etc. would be nothing unexpected.