Yes of course things need to move on, but dropping support overnight as NXP has is a problem for developers. Thankfully I'm in the twilight of my career; I am as you say with X, in my sunset years...
I was pinning my hopes on the open-source etnaviv driver working for imx8/9 devices and giving some hardware acceleration but this looks like a lost cause.
I had also hoped someone on here may have gone through this pain already but looks like I'll need to do a lot more investigation and testing that may be fruitless in the end.
Well this is quite topical then - unfortunately looks like support isn't quite there yet.
And this - https://community.toradex.com/t/graphics-accelerated-x11-application-on-i-mx8-based-som/18027/4 effectively states to forget about hardware acceleration on newer NXP ARM CPUs - so yeah I'm cursing the existence of wayland and NXP's dependancy on it at this moment...