And you can continue to use your corded headphones. No one is stopping you. You just have to use an adapter.
What you or I think about what flexibility devices "should" offer is immaterial. Manufactures change their devices as technology advances. And so too has Apple and the top cell phone makers, like Samsung and Google, which no longer include a headphone jack in their premium devices.
There are loads of different options for Bluetooth headphones. Personally, I'm not an in-ear headphone lover. But I do have a pair for the gym, which are Bluetooth, with a band which wraps behind my neck. If one of the buds pops out, it's never going to fall on the floor, so it can't be lost. For the rest of my listening needs, I have 2 other pairs of higher end over the ear Bluetooth headphones, which are the equal to or even better than most older corded headphones.
I understand you're not happy about these changes, but it's really you who needs to change. You're not going to change Apple, no matter how much you want.
Best wishes to you. We can end this discussion at this point. I get your point, but there's no solution Apple is going to offer you that is likely going to please you. Us going back and forth in this thread isn't going to change anything.