I think true damage needs to stop being added to the game directly...
People already complained about Vayne - though she's really bad right now and her kit is pretty balanced. Conqueror was introduced. Ryze is getting true damage.
All these things have conditions but the issue is true damage creep being coupled in with damage creep. We're already suffering from a lot of damage and too much supporting power from that damage.
Is it really an issue now? I believe Conqueror has abuse cases we still need to address.
I think true damage just needs to be really considered if it's needed to strengthen opponents or not.