[Nose Nuggets]

First off, you shouldn't be coasting in neutral to a stop. but there are plenty of downshift and double clutch threads on here already so ill leave that up to you.

To answer your direct question, no. taking the car out of gear without using the clutch is not an issue. it might be a little painful if the shift leaver resists, but under most conditions it should come out fairly effortlessly.

The rev-matched downshift is supposed to work as you described it. if not for those pesky synchros you would have no resistance given your revs are =. essentially you are doing the clutches job for it by making two sets of components rotate at the same speed before they connect.

If it starts popping itself out of gear, or you feel a lot of play while in gear, then there is cause for alarm.