if on-hit is busted on Kog'Maw and crit is busted on ADCs then WHAT DO YOU WANT ME TO BUILD

I have been going crit/triforce Kog'Maw in my recent games to try to be the better person by no abusing Rageblade and I get constant flame but that's not what really bothers me. What bothers me is that people STATE that champions are free to build how they please, that there is some sort of flexibility in builds when in reality there isn't. For Kog'Maw there is literally nothing else that synergizes with this kit besides Rageblade. Kog'maw can't even build IE or ER without it not influencing some of my ratios or resource demands. Kog'Maw needs 3 things really: AD (to do physical damage and ratio on his R), AP (for 3 of his abilities) and AS for his AAing

He doesn't build crit because he doesn't utilize it well, its essentially the same if Azir or Kayle built crit. He also doesn't build crit because his team flame ratio increases by 300% He doesn't build trifroce since they changed it. It doesn't get him to mid-game as fast as other champions and honestly Rageblade gets him to the mid-game faster than anything. He only build Rageblade because that's all that suits him, which is a huge problem. The item is a problem, Kog'maw's reliance on the item is a problem, the lack of flexibility is a problem.