We've just renovated and have 3 bathrooms. no baths. Large walk in showers. We did, however, do the plumbing for a bath in the largest bathroom in case we ever sell it. We don't take baths, so no need to be cleaning the dust off it constantly.

If you won't use it, then I would get rid of it. Otherwise, it just becomes something else that you will have to clean and, depending upon the dimensions, cleaning around the base of a free stranding bath can be a challenge. This may also allow you to have a separate enclosed toilet, double shower and/or double vanity (if you don't already have those), which may offer more practical benefits than an infrequently used bath. If necessary, possibly consider upgrading the bath in the main bathroom to a more luxurious size so that if you do feel like soaking in the tub, that option will still be available.

We are literally having the same debate. We have a 12 year old and 9 year old, house doesn't have an ensuite as such but dual living set up with one bathroom on the ground level and one on the first level. At this stage we are thinking no bath...will be interested to see what you end up deciding too1

It probably depends on where you live. If there are lots of families then i think the 4 beds would be the preference, 3 brms are a lot more common so often 4 commands a premium. An ensuite is always desirable but i would probably just look at converting the linen into another toilet. And create built in storage in all the beds