Doesn't matter what stern does, someone is going to complain. They have been updating pins left and right the last few months, if anyone truly believes stern has abandoned kiss you probably are paying a little too much attention to the garbage written on the internet.
They can't work on every single game all at the same time, and their recent history shows that not only will there be an update there will be a big one. Just relax, play some pinball and enjoy the game. If the game's code is going to be a concern for you simply don't buy it next time until you feel it's not.
Everyone that buys a pinball machine knows the state it is in, you also do not get any promises whatsoever when or how frequently there will be updates. There of course will be updates, but if you have expectations of some kind of timeline that meets what YOU want, you should simply wait on the purchase.