Having bakes in your hashtory isn't a prerequisite or anything (heck no, we'd never get any new bakers that way KEK), it's just a way of transparancy for whomever is baking at the time.
It's the current bakers choice to hand over(as usual), we just try to remove some barriers by giving currentbaker a peek into the history of futurebakers :)
It has worked okay so far, I'd dare say.