That's a really odd thing to say.

I don't really care about this but here's an example:

I have 2 27" screens, usually connected to a windows box, but while working they're connected to a MBP.

Before the MBP they were connected to several ThinkPads where I don't remember what screen size or scaling, I don't even remember if I used X11 or Wayland. But the next ThinkPad that will be connected will probably be HiDPI and with Wayland. What will happen without buying a monitor? No one knows.