I’m not sure an integrated trash receptacle is the best idea. The armrest bag is easy to see and gets taken out generally before exceeding the structural integrity of the bag. Imagine the fermented nonsense that would build up in any bin that is even remotely invisible because of its built in nature, or the nastiness that will build up in leaks, stuff thrown in without a liner, etc. I can’t believe the nasty odor that emanates from the galley trash carts when they’re getting changed - not something I want to invite into the cockpit, especially under a July sun with the greenhouse going full tilt.