Damages is right now off the charts and that's why tanks are better than 99% bruisers.
Every AP mid have more than decent damages / burst even utility-oriented champions like Lissandra thanks to Thunderlord and DFT.
Every ADC has either better sustain / better DPS thanks to Warlord / Fervor / DFT (for Jhin).
CDR is cheap and easily accessible for everyone : sure, Frozen Gauntlet "only" deals 100% base AD, but it also comes with 20% CDR => more skill spam, more Sheen procs and suddenly, the 100% base AD sheen proc becomes very powerful. Since the mages rework update, AP also have easy access to CDR.
Grasp of the Undying added free magic damages and a bit of sustain which is excellent for many tanks because most of them don't have innate sustain. Yeah I know, the sustain isn't big. But the next time you get killed by Ekko Tank or Maokai at lvl 6 and the ennemy survives with 50 HP, think again about Grasp of the Undying.
On the other hand, you have the bruisers : while having decent base damages, they need 1-2-3 (depends on the champion) offensive items in order to deal meaningful damages and then they have to build tanky. Because many can't afford to build a first defensive item, they WILL be a lot more squishy than tanks in midgame, in a game where the damages are off the charts since pre-season and the keystone masteries.
They will also take the risk of being a hinderance to their team if they fall behind in lane while a tank can reasonably fall behind in lane while still being useful thanks to his CC and tankyness. This is mostly due to the fact many offensive items had their price nerfed. And Trinity became an ADC items and is now shit on many bruisers.
Yes, it is also tilting me. But I hope it will change soon.