>Barely any customizations that aren't tied to significant velocity improvements

I never was interested in the tinkering side. The functional side has been very handy.

For example, smart thermostats reduced the heating bill 40% while leaving the place warmer where we actually are.

Smart dimmers on lamps let you dim them in the evening, or turn all the lights off with one push.

Your use cases may vary and the answer may be none do it but a good level of smart home things are quite practical.