if it's clear the fit between employee and 
      team isn't there. 

This is very interesting to me. How good is management at discerning between...

a: "employee 12345 has been here for one year and probably wasn't a good hire"

and...

b: "employee 12345 has been here for one year, and they were probably a good hire, but they're not a good fit for their current team so let's get them to a new one!"

???

On a human level, I'm a firm believer that (b) happens a looooot. Personally, I've been anywhere from a turd to a star depending on company culture and team fit, and it wasn't me that was changing.

But I am amazed there are organizations that manage to spot (b) and actually correct it rather than cutting a person loose or just pidgeonholing them as a low performer.

Def seems hard to do. You could pass an A many times before ”proving” they aren’t going to fit in any team.

One way to side step the issue - trust the hiring process. I haven't seen very many issues, but Meta seems to give people multiple chances, on multiple teams, under multiple managers, before doing a pip (or whatever the equivalent is).