Sure, it's easier to use a tablet while standing, but that's what I use my phone for, and it's always with me in my pocket. If I'm going to carry a 13" tablet around it might as well be a laptop which is thinner and lighter than a tablet + keyboard case.
Then there is always something annoying that I can't do on an iPad so I have to grab a real computer to do it.
I tried using iPads many times over the years but ended up selling them because a laptop + smartphone does everything I need better.
Besides, you can’t get a MacBook with cellular and you can’t download movies to use offline with most streaming services on a Mac since most of them don’t have Mac apps.
We travel a lot. Even I take my laptop + iPad + external USB powered/USB video display that works with one USB cable. Most of the time I just use my external display. But I can use my iPad as a third display.
I really use my personal laptop for nothing. I left it at home while we are spending a month and a half in another country. When I get off work, I don’t think about using my computer for anything - I don’t do side projects and haven’t for 30 years.