Saxenda is a little different, it has a much shorter half-life which is why you have to inject it every day.
Mounjaro stays in the system for quite a while so missing one week would not result in the same drop that stopping Saxenda for a week would, it would just be a more gradual reduction and pick back up when you resume, so you'd just get a bit more appetite back but not too much.
I think, as well, people are looking more to avoid side effects while they are away rather than to be able to eat and drink everything in sight!