This is a perfectly accurate description of the problem. One has to type with the tip of their finger to reproduce it. I recommend to test this using the free Touch Screen Check app, here:
https://apps.apple.com/app/id1542546774
I took my iPhone 15 Pro Max 512GB (with a price tag of 1,8291.95 € in Slovenia) to the Apple Premium Reseller today and the person at the store was very dismissive, denying any possibility that the issue could exist at all, not even looking at the phone, although I pointed out that the problem is quite widely reported on the Internet, citing this very Apple discussions forum. He said I can leave the phone there so the technician will run diagnostics. Finally I went to my mobile network operator where I actually bought the phone along with a subscription plan. They will send the phone to the before mentioned Apple Reseller and I will hopefully get a replacement. But I’m not very excited about this, because I suspect the chances the new phone (if they will replace it all all) having the exact same problem are quite high.
The problem is not some minor annoyance, it’s an actual deal breaker. Typing is so frustrating it’s barely usable.
I have owned iPhone 4, iPhone 6S Plus, iPhone XS Max, iPhone 13 Pro Max 512GB and none of them exhibited such behaviour. But as it turns out, the problem seems to be dragging across many iPhone iterations, affecting an unknown percentage of devices. Please see similar problem reported here: https://discussions.apple.com/thread/253216410?sortBy=best