I always think about Lindy effect [1] in this context: the life expectancy of a technology, idea or (in our case) a societal habit is proportional to its current age. It follows, then, that the idea of a multi-purpose computing device may also wear off in certain areas of life, or for certain types of people. Not always, not everywhere is there a need for complex or complicated devices or systems. There will always be people who seek or prefer a simpler, quieter life that involves as little technology as possible.
What's really interesting is that many of these people seem to have a remarkably deep understanding of technology, and great skills [2]. Possibly because of this knowledge, they're really clear (or, pedantic :) about what they don't need.
In the end, though, I've come to think that this may be more of a simple psychological preference (for less stimulation) than a rationalized choice. Who knows.
1: https://en.wikipedia.org/wiki/Lindy_effect
2: Some of the people I really look up to: http://collapseos.org/, http://joeyh.name/, https://sassenrath.com/
In the "golden era" computers were more or less advanced calculators. Now we (as a population) expect to give entertainment and give advice about our lifestyle, like we do with smartwatches or fitness devices.
That's a lot more complicated than writing text or inputting numbers into a grid