It could, but I am willing to bet that is even more niche than going to a physical shop.

The kind of experts capable of understanding if they are ordering hardware that is supposed to work together instead of blowing up in some form when assembled, is quite tiny.

I'm sure it's rarer than I'd like to think, but if I managed to figure it out as a teen in the mid 90's without much in the way of internet access or budget, it's still probably easier today.

Anyone with a modern internet connection and a bit more patience than money (or at least a willingness to learn) can hop on Reddit or PC Part Picker and get a pretty good idea of what is out there and works together.

Compared to the days of making sure you had the right number and type of ISA, PCI, and AGP slots, assembling a PC from parts today is a breeze. Shopping online keeps costs low and places like Microcenter are great for buying in person.

I only haven't built one in a while because my current 5-year-old workhorse media/editing/gaming/everything PC shows no sign of needing a full upgrade any time soon. Sure I bought a new GPU after a few years when I got bitten by the experimental VR bug but other than that, it was an afternoon buying parts and snapping them together, an evening installing software, and 5+ years of "just working".