Replying to Do your feet move in your boot when you butter?

I got fitted for boots today for the first time ever. I’m coming from super old full tilts and went with technica mach 1’s. They feel great, but I feel like they’re too comfortable lol and after trying them on over and over now I’m wondering how all of your guys boots feel when you butter especially. Are you locked in the whole way or do you have some slight foot/heel movement when pressing into it? They say to go to a boot fitter but I’m pretty sure mine just wanted my money because I’m having second thoughts, as I don’t feel completely locked in when pressing forward, but the fitter insisted that they were my size. I’m a size 10 shoe and he put me in 27.5’s. And words of wisdom is appreciated.