Known good hardware I expect. There's definitely some hardware out there which is sorta-kinda supported on Linux, but only really works for one kernel version on one distro, and doesn't only supports the bare minimum of requirements.

> Bluetooth pairing fails occasionally.

I never had this issue on Linux until my most recent laptop, which shipped with a Qualcomm 1103 card, which gave me no end of issues with Wifi and Bluetooth (resume from sleep failing, weird power drain, random drop outs).

I swapped out the wifi/BT module for an Intel wireless card (AX210), and all the above problems immediately resolved themselves.

Maybe it's just the bluetooth hardware?

> Plugging in a new display doesn't immediately work.

I've honestly not had to worry about this in at least ten years across ~8 different machines. It's just worked on all three major graphics vendors. I haven't used Wayland yet, so I don't know if if that's a factor.