its all personal preference Charlie but i don't have a problem with loading and waiting times with RB. and as rharv says if you save as seq files you get all the changes saved.
you know BIAB inside out but for those of us who learnt BIAB in the early days then used PowerTracks as the next stage for editing midi (it was only midi in those days) moving from BIAB to RB is easy and seamless.
what is 'under the hood' (as i think they say in the USA) with BIAB is in plain view in RB.
still i hope the OP finds this discussion useful and finds a way to make thge music he likes with advice from all of us