It’s still more waste. An adapter is a bigger use of materials, extra cost, and another point of failure. Hardly a sound decision for a self-proclaimed “sustainable” manufacturer.
The removal of the headphone jack is what made me call complete bullshit on their whole “repairability and sustainability” schtick. At the same time of the removal, they began selling their own wireless earbuds. So now you can’t use wired headphones with their phones, and instead have to buy a pair of wireless ones (which they conveniently sell to you) which will eventually have their internal batteries die and need to go to a landfill because none of it is repairable. I initially thought they were a pretty good company with decent values, but ever since they did that I no longer care about them.
None of those points demand the removal of the headphone jack as a compromise.