I think a lot of these next questions come down to who is using the space and what stage of life you are in. There may not be a right or wrong answer, just preference.

For example, if kids are using the jack and jill-- then its a great way to get each kid their own vanity area! Score! If it's primarily for your grown children visiting at the same time-- then it's remembering to knock bc you don't have your own bath. Far less enticing.

For me, mudroom to manage kid sports gear is a very big deal! We put lockers down one wall and a countertop down the other. For you, maybe its not.

I use the office to pay bills, play on the computer and store /use craft supplies. Our "office" is where kids do projects, I drop the mail and we leave "in progress" legos and multiday projects etc. We like being connected and in easy yelling distance to someone watching TV. That would be really different from ones needs who actually work from home. I'm assuming they would prefer to be closed off.

Everything to the master bedroom side of the kitchen feels like "private space". Maybe you like it that way-- but to me it feels like a lot of space that isnt' communal. I would want people to feel more ok about using that bathroom and the "office", maybe having more kitchen pantry there, or a better connection to the back yard.

I think the hardest part in a remodel is overcoming how you've always lived . I would encourage you to really try to start fresh with a drawing instead of just thinking of moving the walls that are existing. Play with the drawing, rename the spaces--think big!