The new calendar trigger is great! Means if I want to make a schedule for my hvac or my lights I can simply make a calendar. Put events when the lights/hvac/whatever should be on and make an automation that turns the thing on when an event starts and turns it off when an event ends on that calendar.
Unfortunately though HA’s OOTB calendar options all involve other services. You have to configure google calendar or something that supports caldav and then manage your schedule calendar in that other service. This makes it more difficult to set this up and likely creates a dependence on a cloud service for what should be a simple task.
I would like the ability to add and manage local calendars from the calendar panel in the HA UI. That way I can make simple schedule calendars from there and use them in automations. No other services required.