Let to start to say that Flatpak and Waydroid is Evil for Librem 5, if you dont believe me then ask you why you are here about.
Evil flatpak it is using newer gtk which dropped support for GL ACCEL, so this is why.
Some critical HARD ACCEL for BUTTER still off on L5, thanks to super evil linux & opensource. IMHO.
This just mean that device is ready for basic 3D, i love 2.5D Games.