So what? They never had a team that was 80% robots before either. Since when was it bad to try something different?
They've always had costumed characters before, either on the Heroes side or on the Bad guys side.
The only difference is that Zenkaiger gets more civilian costumed characters by default on the core team. That's their gimmick for this year. That's fine.
Nothing wrong with trying different things, but it won't always satisfy every single member of the core fan base.
But that's fine, I don't expect them to always satisfy me every year.
That's just the odds when you come up with new ideas & gimmicks every year.
I'm sure there were certain years of Sentai that you prefer over others along with some years you didn't care for.
You didn't seem to care for Kyuurangers. I really loved that year and loved the entire cast.
That's the thing, not every member of the Sentai / Rider fanbase will enjoy every single years iteration.
That's how we're different.
And some ideas don't really jive with me at this point.
The concept of a Senior Citizen as a core main member doesn't make logical sense.
But that's just me. You seem to be stoked with the idea. More Power to you!
Don Brothers might be that year / iteration that works really well for you.