But I'm inclined to agree. Just look at the 6 and 6 Pro. They rolled out an upgrade, ruined cellular connectivity for a good chunk of users, and then all of the engineers peaced out for the holidays, with no way to downgrade to a usable release for effected users other than wiping their entire phone and starting from scratch. For their flagship phones.
With word that the 6a is ditching the headphone jack and rear fingerprint sensor, and also inching up in size to gargantuan phablet dimensions, it'll be easy to switch away in the future.