@EeveeEuphoria Ah yeah, Wayland is sort of designed not to give control over screen placement to the individual windows... I think XWayland gets some special privileges there, but not all. This is mostly for good reasons (it abstracts out what a screen is and how it works, so clients don't have to worry about things like complex mixed-DPI multi-monitor desktops where there isn't even a single pixel coordinate system), but it does break fancy hacks like the ones you mention, unfortunately.
@marcan dang, that sucks. the only thing i might know of that might work is the webamp desktop client, since i know that thing takes up the whole screen (my window closing effect is that classic fire effect, and whenever webamp closes, my whole screen is on fire, meaning that's how it achieves that)