Raspberry PI

Gnome terminal supports everything you’re asking for

https://help.gnome.org/users/gnome-terminal/stable/pref.html.en

TLDR, no

The cpu isn’t the only piece of the puzzle. 6.5 kernel is only just released, and at least just supported on Debian testing.

It’s not crazy that you haven’t setup any power saving profiles, or that the kernel doesn’t natively support these new chips and architecture.

HDMI 2.0 has limited support for high-res displays at 21:9. Check that your cables also are up to the task.

Running both the internal and external display at these high resolutions will be a challenge, only getting 30hz here makes sense.

Mr Chromebox has a ton of tools and info about this. https://mrchromebox.tech/