No issues whatsoever with this setup and X11.
I call bullshit, you may have no issues with X11, but you definitely had issues with the "setup". I have never managed ever on any distro with any device to get X11 to correctly identify multiple different resolution / refresh monitors correctly.
I've always gotten it to work... except for the refresh issue, but the reality is X11 is very poor at this. Bonus points if you need to scale across one monitor only. That I've never gotten to work.
Last time I used X11 I switched away from it out of frustration and haven't looked back. Network transparency isn't worth the hell of trying to use X11 as a modern desktop. It was great back when hardware was static, but on a laptop with different docking stations, maybe connected to a TV sometimes to watch movies it is simply amazing that X11 hasn't made my put my fist straight through the screen on multiple occasions.
No issues? Man I bow before you oh master hacker. You are truly a god amongst us mere mortals.
Do I sound pissed? Yes, X11 has pissed me off in ways Wayland hasn't (yet).