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The annoying thing is when the flight crews black them out for everybody with a single central switch and you have a 14+ hour flight with the lights off and windows disabled and can't even get a dimmed view outside. Great for the flight attendants who cut down on workload by trying to get all the passengers to sleep the entire flight.

They never go full black though? You can still adjust them (marginally / within some limited bounds of very dark to dark) from what I remember.

Sounds great until something shorts or fails and the tinting goes full opaque while driving!

The problem with LCD windows like that is that they default to opaque, and require power to align the crystals to become clear.

Fine for your fancy boardroom, not so good for a vehicle when a minor hardware fault can instantly render the driver blind.