If nothing else goes wrong, the heat thrown off by all of those controlled switches could cause issues in a small closet.

Regardless of the brand, this whole approach is wrong. Power should go from fixture to fixture and wall switches are only used for control and can be a separate low voltage network. Sure, this approach may seem more familiar to traditionally trained electricians, but the approach is a waste of copper.

A smart dimmer switch is useful for retrofits where the walls are finished and traditional wiring is already in place.