I'm not the one trying to shove some agenda of "there is only one kind of good power up".
I'm not the biggest RS fan, but it is here now.
Same with Enma.
Sanji is not Zoro. He doesn't need a power up that works the same way for Zoro.
They are different, but both are meant to make the 2 of them stronger.
You are not forced to like any of them, but trying to pin this "Enma is a better power up than cheap RS" it's a totally personal thing, and it's just idiotic trying to make it like some kind of universal truth.
"what if they have gotten these power ups in the past?"
Then Oda would have come up with a way to make both of them use these items at the time. The story would have remained largely the same. :P