With the Ukraine being war-torn with Russia, the RTA team are struggling.
v1.48 ran RTA mods quite well, albeit with a few niggling Blender issues which weren’t difficult to solve, but SCS seem to have accelerated their production with v1.49 being quickly relaced with v1.50
The newest beta has a large number of changes in graphics, UI and a bunch of other stuff not the least of which is TAA and SMAA. The game looks great now.
I think the answer you’re looking for is that the RTA team with their multitude of models are finding it difficult to keep up. Updates for 1.50 won’t be available for a while I would think, and by that time, we’ll have v1.51