SU7+Hotfix. Devmode on or off. With 1029 the Content Manager is OK. 1030 or more (even if I mix them up it’s always 1030) causes Content Manager to spin but never load and also the game softlocks when you exit. I’m assuming the magic number that breaks it may also depend how many packages are in Official.
I don’t believe so.
In spite of the additional planes, airports, etc., since MSFS launch, that 1030 number is still the same as it was.
Use an addon linker, or learn about and use symbolic links.
You can have a lot more addons and improve (a lot) loading times.