Finally!¹ My biggest use case is not actually creating passes for services which don’t provide them, but being able to create passes without having to install a freaking app.
FlixBus (I might be misremembering) is the only service I ever found which lets you pay with Apple Pay and add a pass to Wallet all from Safari. For airlines and other bus/train services I always have to install the app to do both. Maybe this will allow me to buy tickets on the web then make my own pass.
¹ Assuming I even update to iOS 27, though.
It feels wrong to say something nice about Ticketmaster, but you don't need their app to add concert tickets to Apple Wallet (at least at all the venues where I live). I strictly use their website because I don't trust them.
I've never tried to pay with Apple Pay on ticketmaster.com, but I assume I could do that as well.