I mean, Dancing All Night would've been fine if it wasn't for the fact that it is canon to P4...but in the grand scheme of things, it doesn't matter because it doesn't affect P5 in any way. Besides, it was great to see Adachi dancing.
You know there's an issue when the embodiment of all evil doesn't like something. Anyway, I do like the arena franchise for what it is, even if they were kind of unnecessary, plot-wise.
We haven't had a cross-dressing pageant or a swim suit contest yet...nobody has died from the party permanently...uh....betrayal seems to be on the cusp of happening...
P4A is where some of the best lines come from. Yu: 100 die while 100 more are born! Adachi: You act all high and mighty but lose and your just a loser.