I completely agree with you & the good news is that both the next updates will help improve this.
With the next update, Jobs & Home, it'll be possible for your wife to remain living with you at your home all the way to the maximum weight stage, via a new immobility pathway I have planned. The update will also include lots of new interactions with your partner at home.
The update after that, Sex & Pregnancy, will add a variety of ways to make love to girls at the highest weight stages, including in the Dizzy's facility.