Totally agree on the flight expercience it's way more nicer to fully use the fold away table, instead of having it rest on or against your belly, being able to tighten the seatbelt in stead of having to loosen it, and see the look of relief of ppl in the next seat, when they think "thank god, not a fatty or a small child".
Reason 1 and 4 also make perfect sense.