I've had 3 turntables, 3 arms, 4 cartridges, 2 phono stages, 4 amps, 3 speakers, and roughly 3 sets of speaker cables and interconnects and 2 sets of power cords. In 30 years. That is a pretty consistent 5 to 10 years, sometimes longer, per component.
I think you are right to question advice from people who don't know what they're doing. Which yes it is clear to me churning through gear demonstrates a lack of ability. Either that or the person simply likes change. Either way, why would you listen to them? Because if you want to be happy a long time what do they know about that? And if you just want change, what do you need them for then anyway?
So a total waste of time- and yet how right you are, makes up a lot of what we have here.
Unless, you learn how to read them. This is the art of making sense and culling useful information out of a lot of blathery randomness. A highly sought after skill, since if you can master it then guess what? You can be like me: happy as a clam, 20 years since I had a dud, and all from reading reviews and comments just like the ones around here.
Wish I could tell you how to do it. Lord knows I've tried. Maybe not lately. But search around, they're there. It doesn't happen by accident. There is a method to the madness. Happy to help any time.