I’m sorry to hear that.
While 4.3.1 will probably come out within a few weeks, it’s only meant for the most critical issues like crashes etc. Bigger changes are too risky for a corrective release.
There is the quality project coming up that should also target these regressions. There is a task for Grease Pencil: #130518 - Grease Pencil: Code Quality Project (Dec 2024) - blender - Blender Projects
If there is something important missing there, please leave a comment.
If these issues are hindering your workflow too much, I recommend staying on 4.2 LTS until 4.4 and see if the transition is better then.