I mean why would anyone really care to deal with DNS anyways, just a bunch of fluff. Real IT admins just memorize IP addresses. Why would I bother dealing with all that DNS hassle?

If its easier to remember this site by its name, why wouldn't it also be easier to remember what your file share's host is by just remembering its name instead of some collection of digits? Do you remember people by their phone numbers or by their names?

Having functional local DNS is not complicated these days. On tons of systems it comes out of the box, you almost have to go out of your way to not make it work. You need to actively try to not use it.