Maybe. Or maybe it is one of those things that you think you don't need until you start using one, and then you can't believe you waited so long. :)

Portable wirless mechanical keyboards are niche, but not uncommon. I bought a Keychron for my daughter and she loves it, though admittedly I'm not sure how often she uses the ability to move it between computers.

You can also connect it to your phone, so you can use it for portable long form writing or programming with just your phone or tablet and keyboard if you don't have a laptop. I'm sure it is better than using the Surface keyboard, for example. Many laptop keyboards also suck, especially if they use an ISO standard keyboard when you already have muscle memory for the ANSI layout.