Maybe I have a high tolerance for pain/weight, because I carry my 15 inch with me every day, along with a 12.9 inch iPad Pro, and don’t really think twice about it. Granted a 13 inch would be easier, but I guess it comes down to what you’re used to. When I went from my 2013 15 inch to the 2017, the difference seemed noticeable. But before that, carrying around the old 15 inch didn’t bother me.