Apple and Google seem to have approached removing the headphone jack, not as a way to reduce costs to the customer by eliminating an obsolete feature they don't use but, instead, as a way to increase the money they can squeeze out of customers by forcing them to replace perfectly good headphones they are currently using with new headphones
hopefully made by Apple or Google.
I'm honestly not surprised by this. Headphone technology hasn't really changed for many decades. A good pair of cans made a very long time ago are probably still a good pair of cans. I have some Audio Technica woodies that I absolutely love and are still going strong after more than a decade. To Apple and Google, this is a state of affairs that cannot be allowed to stand! Where's the planned obsolescence and constant product turnover? Apple tried to make their earbuds a disposable commodity that need to be replaced frequently, but people caught onto the fact that it was just due to bad build quality and kept buying stuff from other companies. So, change up the connectors and force wireless standards that are, quite frankly, not that good for audio and ripe for eventual upgrade (i.e. bluetooth) into headphones so people won't be able to use the same pair for decades. Profit!
So what should consumers do if they like their current headphones or just don't want to deal with adapters, charging bluetooth devices, or sorting out multiple incompatible connectors? Buy phones that still have headphone jacks, like the Samsung S9.