Yes, you could get impression from our talk, that in future there's one best team and everything else is shit, which is not true.
It is same now, people will tell you that one or another Kamihime is best, but that doesn't mean that others are bad. At least when looking one year ahead most content is not locked behind "one best team", unless you want to get highest ranks at competetive events (but this also holds true now). So you shouldn't have problem with most content while playing casually, you do not need to fear that.
There are also many QoL improvements to game in future, so playing gets less tedious/irritating (let's be honest, rolling gemcha daily is pain in the ass).