Every developer/store has its own policies, or just thinking about how to do stuff. We (the developers) know, since we are in daily contact with Laminar, that X-Plane 12 is in a phase that some things will change in the near future. If a developer choose to ship an aircraft now, and have to redo some stuff, when the changes will arrive, good for him/her. Though, in the meanwhile, something might not work right, until the developer patch it, and the user experience is not going to be great.
Another developer might choose to postpone the release, until he/she has the confidence that the product will perform (almost) perfect as intended, and give the user a much better experience. In both cases, will be user that will complain for the one or the other. You can't satisfy all.
But if you are 'anxious' that no one here cares about bringing our aircraft up to XP12 standards, you should not. Beyond that there are many new aircraft under development from all the teams having product in X-Aviation store, that have not hit the market yet, almost all existing ones, are actively being in the works for that. For example, a few days ago I announced the first LES aircraft getting ready for XP12.