Very thoughtful post. All those series were very formative for me, though I didn't recall the conclusion to JLU wrapping up the Batman arc. Tempting me to go back and rewatch them all.

Have you heard anything about this show? Apparently a successor series with the same producers:

https://www.imdb.com/title/tt14681596/?ref_=ext_shr 

 With Bruce Timm running it, I might check it out.

I'm not the target audience anymore but nostalgia is great. 

 Just watched it all now and it's pretty awesome!  Very BTAS but a complete storyline that leaves open and leads up to a more exciting season 2.