It's 100% the interest. I'm the same age as your SO, and as a kid when I got my first computer I'd sit with all the programs eg Word and mess around with the fu

It's 100% the interest. I'm the same age as your SO, and as a kid when I got my first computer I'd sit with all the programs eg Word and mess around with the functions. That eventually gives you a power user level model of how it all works. There's an organising principle that you eventually learn, and anything new fits into it, even if you haven't used a particular new program. People who don't care about learning this end up with a bag of shortcuts in their head and have to remember things like how to add a table of contents. And of course that can change with new versions, plus new programs are just a whole new course they need. Tools are made for people who understand how to use them. We complain that stuff needs intuitive design but it's only intuitive for someone who understands the job.