Sorry but I have had zero use for the headphone jack in many years. Just another place for debris or water to enter the phone.
I doubt Apple did this to make money on the adapter but doubt I could convince you of that. Sorry, just my opinion but have little use for a jack on my iPhone.
Cool ? Apple is a for profit company. They are doing it for a profit. If anything leaving it there for water to get in would be a reason to keep it there to make more money fixing the phones.
Sorry but as much as I use wireless headphones because of the fact there is no headphone jack and adapter are just dumb SQ is still superior wired then wireless. You might not care but plenty of people do.