That’s a really weird and dishonest take. If a compositor wants to implement that feature it absolutely can, Wayland or not has nothing to do with it. I’m just saying it isn’t implemented the way you want in the compositors I know of. Seems like all it needs is compositor developers who want what you want.

You can configure this with window rules and autostart apps when Hyprland starts. That’s not remembering what you had open the last time, but it will probably give you the experience you’re looking for.