Not a huge dealbreaker but….
If you enable the “on and off” schedule for a switch under the SmartThings app there’s an issue.
You can add up to 3 time periods, you can enable or disable this as a routine.
But….
If after creating a schedule with one or more periods, and you then decide you no longer want any schedule you can’t delete all on off schedules. Once you delete the last one the option to save the empty schedule is then greyed out. So you have to save it with at least one schedule and then disable it.
In my opinion that’s a bug, not a feature.