Observers firing sequence

[DanRathbun]

@trampy

There was talk of redefining them. Has this been fixed, is it possible to program with no restrictions now?

NO, there still are some restrictions, … and YES there was an overhaul done about 5 years ago.
It was the 2016 release where the overhaul took place. I put links in another topic from a few days ago:

DimensionArea and add_dimension_area? - #15 by DanRathbun

@trampy

Now I am learning Blender scripts and APIs. I discovered that this question is perfectly dealt with there. A created function has its own event loop, so that there is no conflict either with other extensions or with the main software.

Again, see the linked topic where Thomas talks about this subject.