[BlueTemplar]

It has been released 13 years ago.

Unreal Engine isn't an option if open sourcing it again was a goal and/or a means to attract new developers after the death of half of the previous core team.

Old engine foundations doesn't necessarily mean a bad thing : for instance the Spring engine was started in the late 90s, released in 2005, and not only is still used today, the fork of it that is even more successful (and with the fanciest looking games, and the best performance) today, Recoil, is the one that decided to stick with legacy OpenGL3 features rather than radically change to better fit with how OpenGL4 does things(?), in order to not break games !

https://youtube.com/watch?v=GEQmm4UhLAg