I think a lot of people’s choices are defined by where you ride most. If you ride trail centres mainly, or at least places with pretty firm ground for the most part all year round, you probably won’t be the kind of person to bother changing tyres.
If you ride much more natural trails mainly, that can be dry as a bone and super fast in summer, but inches deep in thick mud in the winter, you’ll have different tyres for each.
Or if you’re a racer, you’ll have a stack as you know how important saving time can be, and tyres can make a big difference. I’m far from quick, but at last year’s SITS after the heavy downpour, I decided to put my Bonty Mud X’s on my bike for a lap or two, as the Hutchinson Cougar/Cobra combo I was running were very fast but made a Schwalbe Racing Ralph look like a mud tyre in comparison! Anyway… Result was I was 5 minutes per lap slower on the Mud X’s… Put the Hutch’s back on, and hey presto, 5 mins quicker again!
Black Chilli Rubber Queens all year, when the rear is really worn, buy a new one, stick on front, part-worn on rear. Repeat.
All that I said above though, if you’re not racing (which I’m not intending to any more if I can help it), I think this man has got a good point, there’s definitely nothing else I’ve tried that seems to work so well regardless of conditions.