Being a professional developer who does stuff with graphics rendering and low powered devices that have a finite amount of resources…
Users whine and report that games X doesn’t run and go on to every related forum complaining. When asked to help/diagnose and report the issue, user mumbles about time and motivation and makes a vague promise. Nothing is ever filed.
This happens even with Haiku as it is today. What makes you believe adding games will change that? All you will find is a massive shift in the signal to noise ratio.
Users are not good at reporting bugs.
Game developers - time is money. Game developers are not motivated to waste a lot of time on an OS or platform that can’t support their game. Remember, most AAA games are ported, not written on, niche/alt OS. You are probably not going to get the next Far Cry or GTA game written exclusively on Haiku for example.