I like cities, but I never see the urbanists talk about the housing for a large family in the city, I guess Japan is different in this regard where each family still gets their own house. Only thing being built near me is 2-BR apartments with crummy balconies.
Personal trainers get expensive quickly; OrangeTheory is a good alternative, its coach-guided group rowing, running/power-walking, and bodyweight hiit, its very gamified and fun.
If you can map the dice to an outcome, that would be a useful feature. For example, in battletech if you have a 20-missile launcher, you roll 2d6 to determine how many of the 20 missiles hit -- this requires a table-lookup which slows down gaming.