Exactly, having big ass meatballs with a ton of CC does not really enable bruisers to do their job, you can do a godlike play on lee sin to pick out someone while the enemy sejuani can either choose to fuck your plans up or just fuck your team instead, so you are kind of forced into playing tanks yourself.
You need punching bags to soak up CC, you need your own CC.
Cinderhulk changes, enabled tank junglers, stoneplate is pretty much what tanks take since the GA changes and it could be argued, that it is even better, Adaptive helm cucks battlemages.
Tank reworks/changes, a lot of indirect/direct shift in power for stuff like cho (he is not a tank, by definition, but is a tank in the sense of soaking up dmg).
Ah yeah and ofc there are outliers such as Jarvan being a frequent pick.
Armor shred, % current hp dmg, backline acces (wombocombos), the play pattern of the champion is kind of similar to lee sin if you think about it, except the dmg does not fall off that much and it is way less mechanical in terms of execution and his E->Q is one of those abilities, which is really hard to interrupt and takes priority over other things such as WW ult when colliding, which is pretty funny since Infinite Duress is supposedly turning WW unstopable during the dash.
Also on Tristana being strong and popular, last time I remember it happening was in season 5's tank meta.
Adcs are more important when your team has to fight tanks, than when the teamfights last 5 second because everyone bursted each other to death, longer the fight, the more useful sustained dmg is.