Some creative workflows genuinely benefit from the tablet form factor. I often do serious photo editing on the iPad because I have access to Apple Pencil, and, somehow, holding the thing in my hands like an actual physical object activates some different more analog brain region for me than using a laptop / desktop, and it’s helpful to my creative process. Lightroom for iPad is quite capable but it requires some power.

And then visual artists are often using Procreate, and those files can get heavy as well.

Plus, it’s nice to carry my iPad around with me in a sling and work in a cafe whenever I feel like it. I wouldn’t want to do that with my 16” MBP.