for me it is a convenience, especially now there is only one left. It gives me the possibility to have her tag along in my day to day buisness such as work or going to the store etcetera without me feeling that she gets in the way, part from when she decides to act up.. but the normal shoulder riding for her is between rooms/desks, either shes on the cage in my office and when i walk past it towards the door shell jump on and check out where were going. or when I come in she normally jumps on to get a lift to the office chair. The shoulder riding with this lil
pretty much started when I worked in sales of spare parts for trucks where I had to constantly walk away from my desk and into the warehouse to pick up parts, and parts that required both hands to lift. But yeah you get the beak to chin or mouth every now and then, but for me it is worth it for her quality of life being able to tag along quite a bit. But I'm also one who would take in dogs coming from dogfights that were too agressive to go anywhere else and give them time in a normal setting without cages etcetera to see if they adjusted enough to be rehomed. sometimes with warning labels and quite often without. Being able to work with the police on that was extremely rewarding but that too has resulted in some scars along the way.
As I said in some circumbstances you have to think about the willingness to receive a bite because it is next to impossible, but in cerrtain occations for me it is worth the risk in order to benefit the life of the animal (or a kick in some cases) my families farm where I grew up is full of rehomes coming through our doors, mostly via the police and then "retrained". Getting a parrot is one of them circumbstances since it isn't a domesticated animal and as you mentioned with your toos, the trick isn't just watching out for when they get grumpy you also have to watch out for them beeing too happy. I have found this wery true with amazons, who are quite easily driven to excitement (awesome birds tho, one of my favorite species) But Ive found them quite interactive and they just build and build their excitement when playing with toys etcetera.