Most scheduling tools work the same way under the hood.
They take your available hours, divide them by a slot duration, and hand you a grid of fixed times. 9:00, 9:30, 10:00, 10:30. Pick one.
It works. But it has a fundamental flaw.
The grid assumption
When you pre-generate slots, you make a hard assumption: that every slot boundary is equally valid. But real calendars don't work that way.






