In fact, after Snoke learns Luke’s location he says they will go and destroy him “after the Rebels are gone” - if he had other “legions” taking over the galaxy he could’ve sent a fleet to wipe him out, instead it seems clear that his resources are focused on destroying the Resistance as his next step in achieving “military cotrol of the galaxy”. That line was removed from your edit, but still, it shows that the crawl was not meant to imply the FO had limitless resources all over the galaxy.

I don’t think it needs to be reinstated, it might disrupt the flow of the scene, but maybe:
https://streamable.com/595033