> you've 'upgraded' the same pc since a 486?

Yes.

The most I've ever replaced all at once is the CPU/mobo/RAM trifecta. But even when I do that, I still kept the same storage, case, GPU, PSU, mouse/keyboard, etc.

But otherwise, upgrades are piecemeal. New storage when my current storage is full or I want to upgrade to a new technology. New GPU when I feel like my current one is holding me back. New mouse or keyboard when my current one starts failing. The CPU/mobo/RAM trifecta when the performance gains make it worthwhile, which at this point is about every 5 years.

I'm not sure why this is hard to believe.