I think right at meal time it would be discouraged- if you and your family ever wandered around with trays of food and drink and walked past people just resting their legs, you would also find it very frustrating. Since there are few places to sit outside, sometimes when the QS place is full, it’s nice if people would leave when they are finished and others are trying to find a place. Otherwise, it’s really nice to be able to sit and rest a bit and no one will care.
I don’t blame the people at all- I blame Disney for removing all the places to sit outside except for a little bit by the Dole Whip place (through that tunnel), and a couple of other spots only. Everyone needs a chance to rest their legs, get out of the heat, look over their maps and places, etc.