I also think it’s possible that Rodriguez isn’t used to directing on a TV budget and/or schedule, though at the same time isn’t he known for being a quick and cheap director? I don’t really know his work all that well, but based on his episode of The Mandalorian I get the impression that he’s more of a “fix it in post” guy, and while this might work for movies like Sin City or Alita it can cause a lot of trouble on TV series, especially since the volume require extensive pre-production work, the reverse of most movies these days.
Rodriguez is sort of a Swiss army knife, besides producing and directing his films he also uses to perform camerawork, editing, and oversees the score, sound design and visual effects. So yeah he puts most of his effort in post production. He clearly hasn’t performed all of those tasks for BOBF, but I wonder what grade of imput does he have into them.
Either way, BOBF seems to be, at least for season one, a smaller-scale adventure, so it’s not that surprising most of Lucasfilm’s attention and effects budget is set on limited events like Obi-Wan or Ahsoka.