We were also worried / expecting that Urgot would be wrecked by conq nerfs, but when we actually did them he didn't really have much effect. I think his pattern is more all in compared to the pokey ranged users like ezreal so the changes didn't have much impact.
We're not currently planning any other changes to Urgot right now, though he is slightly better in lower ELO than high, it's not too far out of the norms for most champions. Every kit has some slight skew one way or the other.
We need to see how 10.2 changes land for her, hard to say yet. Generally we think that the players that love karma and the ones we put the most effort to help are support karma players. It can be tricky because she tends to show up in very high ELO as a solo laner.
Over time we will probably continue to focus power into her as a support and possibly look for small improvements to her skills where we can.
Sure, considering that Quinn is actually quire strong right now (balance wise), and that she's still unsatisfying (as you say) we would need to look into mechanics or kit improvements rather than buffs/nerfs.
Quinn historically (and still true today) has a small but dedicated player base. Somewhat few players play her but Quinn mains play far more games on her than other champion mains do. So we do want to be respectful of that community if we do changes in the future.
I don't see a big problem with it right now, it's cool when players discover new strategies for champs like this. Like anything else - if it becomes too dominant of a pick or strategy (OP) we will nerf it.
Not currently planning any Irelia changes, she's a very high skill ceiling champ but seems close to balance right now. Her average winrate looks lower than some others, but that's mostly coming from her learning curve and skill ceiling. With enough games on her, we think you can succeed at any elo. Her engagement and stickiness have been steady for months, so that's also something we consider - are players enjoying and sticking with the champion over time.
Sure - so far the 10.1 changes seem fairly successful. He's 49% winrate across all elos and a low priority pick in pro. Playrate is up by 300% since the changes, so we hope that means that people are still enjoying his play style.
We haven't seen enough data to be sure that he's actually in the right balance state yet though, may need some slight buffs, maybe not.