The master bathroom seems a bit small for that size house and the shower is definitely too small. One tub in the house is fine. Most people want a larger shower.

At a certain level of house, amenities contribute to it's value whether you personally use them or not. Yeah, people like to say "build it for you, not the next person," then complain when that time comes and it is a detriment because it does not hover around the "median line" of design attributes that are an expectation in certain houses. Not always, but usually a 4000sf house might mean a certain level of quality, amenities, and comparables.

The portion of plan does not indicate enough of the house to understand if a Master tub is expected, and there are some unknowns (like where did the Master door get moved to?). Also, the layouts for each scheme are not the best, each has improvement to be made, which may mean that if having a tub in this house is important enough, a design can be schemed that may work better than these.

Larger shower and no tub for sure. One tub in the house will be fine even if resale value takes a (slight) hit.

There are probably better configurations for the bathroom. Adding a tub wouldn't be a necessity for the vast majority of my custom home clients--who tend to prefer a larger, more elegant and functional shower to a shower and tub. Ditto for my remodeling clients--the majority of whom ask us to eliminate the tub when remodeling their master bathrooms.

How long will you be in this house? Will you be selling at some point. I tub in a master bath is very common in our designs. We very seldom have primary bathrooms with no tub and a shower only. Am thinking any future buyers will be expecting there to be a tub in the primary.