I think people also care that software runs reasonably quickly. Among non-technical people, "my Windows is slow" seems to be a common complaint.

Sure, but this is perceived performance and it's 100% unrelated to the language. It's bugs, I/O, telemetry, updates, ads, other unnecessary background things, or just dumb design (e.g. showing onedrive locations first when trying to save a file in Word) in general.

C won't help with any of that. Unless the cost of development using it will scare away management which requests those dumb features. Fair enough then :)

> or just dumb design (e.g. showing onedrive locations first when trying to save a file in Word)

Your example is not one of a 'dumb' design, it is a deliberate 'dark pattern' --> pushing you to use OneDrive as much as possible so that to earn more money.