I do tip for take out but 10-15% vs. 15-20% for eat in. My kids have never had to wait tables but my nieces and other friends’ kids have and it is hard work.
When we get takeout, it’s from places that don’t really have table service, such as Sabor or a mom-and-pop (and grandparents and kids) Chinese place. I’ll remember, though, if I ever get takeout from somewhere that’s oriented toward sit-down dining.