Okay, I see your point but don't twist it.
I'm saying Janet doesn't need to have 4 costume changes, she doesn't need "craziness", fireworks, etc. Just look at the Unbreakable Tour. It was pretty basic but it didn't matter because Janet simply mesmerizes audiences with her talent. That's what I'm trying to say. Awesome staging like in Vegas is super cool, but it's not necessarily needed. Just like she doesn't need to do all of that (all colors for example) in Europe.
Yes, she is restoring her relationship with Europe now but it's not like she 'lost' fans because of her live skills. We experienced her first 3 tours so we know what she is capable to do. People might be scared to buy tickets cause they're afraid she might cancel, not because the show is too 'basic', a lack of colors or 'mediocre'
And about the Rhythm Nation Tour. Using black was done on purpose. Yes, she progressed during the years in terms of the tours, but Rhythm Nation's color WAS black.