I think bushcraft is a fairly benign branch of knife use/collecting. I see it as the younger brother of the Prepper movement that saw how bat-spit his sibling was and least stayed in school. It's at least maybe useful in some regard.
Let's face it: in the second decade of the 21st century a cutting tool is rarely NEEDED. Yes, we all have stories of our knives "saving" the day via delicious irony when we open a package for a coworker who had asked us why we needed to carry a knife. Still, handy as they are, most of us have a hundred more than we probably NEED to use
Bushcraft is a way to actually use the knives we buy with a specific goal. I mean you can buy a SD sticker or TEOTWAWKI tank of a blade for zombie survival, but they aren't going to get much real use. A bushcraft knife will do what you set out to do, survive in your backyard using old knowledge and primitive tricks. It's a good excuse to practice something that while mostly impractical is at least harmless.
Now where I take issue is when people lean so heavily on Bushcraft uses that everything else is garbage. Those folks are just as insufferable as the tactical guys feeling the need to carry 8 magazines and 8 knives that are designed to inflict maximum damage on the gang of rabid meth ninjas they are surely stalking the streets of suburbia. Bushcrafters who can't see how ANY knife put in a survival situation would at least perform SOME function and would most likely outlast the person trying to survive are eye-rollingly irritating. That goes double for the ding dongs who feel that any folder worth it's salt should be able to handle batonning and spine whacking lest they be eaten by a grizzly bear or something. The become zealots of the cult of the tool itself and not the knowledge that wields it.
In short, Bushcraft is a great excuse to do something primitive for the sake of doing it. Knowing how to think your way out of a tight spot isn't a bad thing. Knowing how to at least stay alive when turned around on a trail is not useless knowledge. At the end of the day though, it's mostly an excuse to use the tools we buy when there is a 98.999% chance we will never NEED to use them in such a way.