Humans genuinely dislike change, especially when it comes to changing the way we do things in our everyday lives, and even though we keep discovering new and better ways to do stuff the old ways refuse to die.
We constantly complain about how vending machines rip us off, how much those magnetic strips on our credit cards suck and how stupid and useless red light cameras are, and yet these outdated technologies refuse to die.
And speaking of outdated- why are we still using the same optical media we've been using for over thirty years?
But the one outdated tech that makes me wonder "why is this still a thing?" is the alkaline battery- they're terrible for the environment, a pain in the ass to recycle, and yet they outnumber rechargeable batteries ten to one at retail stores.