Might be ok in most applications.
But sometimes, you can have a really long run back to the controller, and experience some voltage drop, (maybe some induced noise incidently), and if there are any tarnished connections, or grit and grime on the interlocks, bang, there you go, a shutdown. Evidently, it happened enough to where SmartRise thought best to change it.

Years ago, Schindler had low voltage locks, and they too later thought better of it, and switched to higher voltage. That seems to be the consensus here. But you're not wrong in thinking that, in good conditions, 24 volts is ok. I agree.