You make it sound like your opinion is somewhat unusual. I got a meager A3 2016 model few months ago after using an HTC for 5 years - naturally the last 2 of those years I used it to call as the enforced SW obsolescence made the phone almost unusable for anything else.
I dropped the phone 4 times int he first week - it was simply too thin and slippery. All my habits that worked for the HTC were not effective anymore [how to handle it; where to put it, ect.] and new ones did not help. So I went back to the shop and got a protector screen and a case. That transformed it into the GSM I always wanted. Reading books, some movie watching and music. Some gaming as well [for the first time on mobile platform for me]. Great!
And then I heard about the jack and was furious. True, most of my music I listen on a dedicated player which together with the ear plugs costs as much as the best telephone out there, so quality is paramount to me. I also have the phone and Koassilator phrase synthesizer - and the ear plugs go into all 3 devices via the jack. A dongle? Never! The plugs have L-shape contact minimizing stress - I don't need anything sticking out from a fragile, thin, slippery phone!
I look now for several weeks during my commute how many people do not have cases and screens on their phones. I found 3 persons out of at least a hundred [almost everyone uses their phone in the train]. Same at work - one guy out of 50-60 people.
So, I think most of us do not buy this whole scam but I am also afraid that sooner or later all companies will switch. For all kinds of reasons [marketing hype, enforced obsolescence, DRM control, vertical integration] but by Bob NEVER do anything that actually benefits your customers. For real!