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It's a landline thing. It used to be the case on analogue lines in the UK that the caller controlled the connection (probably because they were the ones being billed for it and the recipients phone couldn't communicate it's time to stop the bill).

That "feature" was copied into the digital world. Except now there's a very short timeout where after the recipient hangs up, the connection is terminated.

It isn't completely insane. in the days of landlines it makes sense because you can hang up the phone and go to a different - more comfortable - room when you realize the conversation will take longer. I don't think cell phones have ever had this anywhere.

I'm old enough to remember when the phone system in the US behaved this way.