HiDPI. It's somewhat unusual for a top end laptop to have 1920x1080 screens these days, and Wayland doesn't support 4k very well. You can upscale, but it looks like garbage, or it has a 2x mode, which draws image and such slightly too large, or you can deal with everything being tiny.

For gaming, the latency is bad and always on vsync is horrible. They've fixed the 60Hz lock though, fortunately. This only applies to gaming though.

My primary issue with Wayland isn't quite so much that it lacks these things, it's that they seem to be of the opinion that there's only one way to do things, and any other use of the visual display system is wrong. I just have this weirdly oppressive feeling about my inability to configure it the way I want it, the same feeling I get from using Windows. Just... let me be me. I get that this is a non-technical complaint, and that it ultimately boils down to "it gives me the heebie jeebies" which isn't an argument, but it's still how I feel about it.