I feel you kinda missed my point. Every series since Heartcatch had a pretty clear cut 'theme'. Some seasons before Heartcatch had that, too, most notably Splash Star's focus on nature - through Cures (their names and even attacks), through fairies (and their ... country?) and through enemies.
Heartcatch had some consistency in naming - mostly related to flowers - and in enemies - all related to desert. Desert generals make the flowers in human hearts wilt. It's very clear cut.
Same goes for Suite, very strong music theme.
Smile had no consistency when it came to naming Cures, sure, but everything else was strongly related to fairly tales - both the 'country' they were trying to save as well as the enemies.
Dokidoki was the weakst of the bunch as the 'trumps' theme didn't really shine through. Cures are related to that, yes, Mako-pi comes from Trump Kingdom and occasionally they use some attacks related to cards (Straight Royal Flush was the name I think?) but again, it feels kinda weak.
But even though it was weak in Dokidoki it was there. Happiness Charge doesn't have anything like that. Hime's country is something completely random, enemy generals are completely all over the place and there's no pattern in naming Cures. The theme is completely gone.
There are bigger problems with the series, sure. Doesn't change the fact that having no theme doesn't really help the series in the slightest.