Pushing 60 years in age, I've come to think of tubs like diapers. You generally need them when your very young of very old.
My father came to live with us at age 86. First two years, he used the tub / shower combo in the furnished basement where he lived. Following year, he used only used the tub / shower with my FIL's shower seat to take a shower. At 89, we got a walk in tub that my father used for a shower and bath at least once a week.
In retrospect since my dad died, we should have got him a walk in tub / shower when he first came to live with us, but he wouldn't even consider it (during his last year, he LOVED taking a hot bath once a week being able to sit).
When we first moved into our house close to 20 years ago, 3rd floor had master bath with a LARGE jetted tub, but with with a water tank heater, hard to keep it filled with HOT water (tankless has helped there now). Had a tub / shower bathroom for the two bedrooms. When our boys came to live with us through foster care at around 7 years old, the tub was invaluble for giving the bath's and "cleaning them up".
Knowing we're going to sell the house down the road sooner or later, wanted to keep a tub ulpstairs as we thought it could be a selling point for a young family. We had enough room in the master bath, that we did away with the jacuzzi tub and did a nice size shower. HOWEVER, my wife wanted to be able to take a hot bath from the bedroom and not have to go anywhere else in the house. Even at my age now, hot bath at 115F water temp with epsom salts feels to good to pass up (from time to time, since my dad died, I even use his walk in tub to "rest my old bones"and honestly, when I do use it, love it).
You don't plan for age, but particularly with younger families, I see the use in a tub. Thinking back with my boys and even myself, hardly ever use a tub from ages 14 through 49, but after that, being able to relax in hot water when your old or washing kids when they're young does have advantages over a shower only.
Reality is even with a HUGE shower when I younger (never had one) I'd be afraid of wild sex for breaking the glass (and actually never really thought of it LOL). Now, it's just nice to have enough room to have you and your wife actually clean off together as if any hanky panky were going on, I'd be afraid of slipping and breaking something
(or perhaps
).