What's the point of making a frontend?

Building more and more stuff with AI agents, it strikes me that it is incredibly easy to make web frontends now. It’s not really a surprise given that these things have all the junk on the internet (all that tasty HTML, JS and CSS) in their weights. The surprising thing for me is that this effectively shifts the responsiblity a vendor has to produce a decent frontend at all. If you’re providing an API, with good, agent-friendly documentation and permissive CORS, anyone can make the web frontend they want for the cost of some tokens, completely bespoke to what they need. No need to wait for the vendor to add that view that you’ve been asking for, just get a clanker (or three) to code it up for you.