Because as a layperson, I would not have thought a company could get a patent on clicking a button to purchase an item online.
Now that I've helped you out of the quicksand, let's do battle:
"[I feel like] it's not like there's some patent issue for using USB or wifi in your printer over whatever interface used in 2000 compared."
I could certainly try harder to finesse it, but I don't see any sensible place to insert a "YMMV" into any part of that sentence.
Do you really believe "researching" is needed?
Like, in every other domain and product category, a company can slap a faster processor and more RAM to the next iteration - as they do -, but this is somehow prevented in printers by patents?
I'd say the extraordinary claim that needs extraordinary evidence is not mine...