I would be very surprised if less than half of the users observe this behavior, since I installed endeavourOS several times, and until this time, I always had to search — through autoconnected wifi — how to stop the welcome app from autostarting, after it autostarted yet another time.
Changed Welcome in version 24.5-1, now it does not hide those buttons on an installed system.
Welcome checks the availability of the internet connection rather early, and wifi connection might not be available at that time, even if it exists a bit later.