T-Mobile Family Allowances

About a year ago, T-Mobile introduced this Family Allowances feature, for $2/month. It lets you control things like how many minutes and texts family members. It was a good start, but needs to be enhanced. In particular, there are only pre-set blocks of time that you can toggle on and off. That just doesn't work, they need an option for arbitrary time blocks (or at least the nearest 1/2 hour). Unfortunately, in 15 months of using it, I have not seen one single, solitary improvement made. I think it falls into the frustrating category of abandoned software, software that never gets improved. T-Mobile hasn't done much to market the feature.