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If you design it from scratch and with nice bits then it will be great. Separate bath and shower are useful and it's not like you need to break dance in the middle of it so if it's compact then fine. Storage would be the thing that I was thinking about, if you make the space work hard in terms of where to put towels, spare loo roll, toiletries etc and keep it out of sight then the space will feel bigger.
Maybe move the rad behind the door and then you could have a full heigh storage on that wall instead
Tenderloin-
Our current bathroom is a smaller room next door to this one (about 1.8m x 1.8m so probably too small to be a bedroom) and we are aiming to use that as a laundry/utility room which could have storage for most of what you mentioned in it. Hopefully that's another way of keeping the bathroom looking a bit tidier and less cluttered.
tbc
It's so long since we've been allowed to play football that I'd forgotten why a separate bath and shower are so useful.
The issue is that we're moving the bathroom because the current one is nasty and feels cramped. We're worried about making another one that's nicer but still feels cramped.