I don't think it's necessarily demonstrable that Frontier doesn't care about the game anymore.
My suspicion is that the primary cause of bad updates is a lack of resources, which explains the lack of an open beta testing phase, which explains the state of the release.
The lack of resources, at least on the smaller team assigned to the interim update schedule, would account for much of the recent bugs introduced, as well as the lack of bugs fixed.
The reason for the lack of resources would likely be a cost-benefit analysis comparing the projected income increase from the interim updates vs the major upcoming update.
Personally, given that the game is not subscription based, I can accept the level of quality control being achieved in the current model. The major issues introduced and recognised by the dev team as bugs are usually ironed out within a couple of days of the release. My advice would just be to ride it out in the interim, as complaints aren't likely to change business structure unless there was some indication of the game as advertised being unplayable in the longer term.