While I really love DIS thus far, I do think it lacks one of the things the older 60s and late 80s-early 2000s shows had. With them, they felt very detached form each other episode wise, but it could be a very microscopic exploration of a character or several characters. My mind goes to the DS9 episode where Odo was fooled into thinking the female changeling was Kira. It had a slight over arcing comment about how the changelings see Odo, but that was incidental at the end of the episode. The entire show was about exploring how Odo felt about Kira, completely aside from everything else that was happening in the rest of the series.
I get the modern fashion of TV shows is exclusively serialised (unless it's a comedy series), but I want them to go back to the old style syndicated shows eventually.
In my opinion, I think those types of episodes worked when each season was 26 episodes long. Now that the episodes per season are around half that, I think that the standalone episodes would feel like filler.