Aikatsu friends : mostly consistent decent animation, good music, fun/cute/likable/gay girls, AND constant yuri subtext? Perfect idol anime!
Like I said before, its main theme is the bond between pairs. Yeah, the partner cups from OG's s2 but done better imo.
Also, Coco is voiced by Ichigo with a bit of Aoi's personality aka their AI baby so the old fans don't feel too disconnected.
Gay stuff? Let's see: besides everything mentioned above, Mio basically stalks Aine in 4-5 episodes and it's adorable(?). I don't want to spoil episode 11 but it's VERY gay and the only justification we get it's the equivalent to a "no homo", 100% worth a look!
Mirai and Karen = a married couple remind me of Mizuki and Mikuru. Maika and Ema are also very close.
If I really need to point out a negative it would be the endings CG is kinda stiff, pretty distracting 'cuz the song is pretty good.