As far I know plasma is the one you want. In most of cases ,you can approve for replace as it would generally replace deapreciated or no longer supported or buggy modules which will be done by comparison in Arch Repo ( software collection , moreover garuda developers also ).
So Yes.
Full system upgrade updates all packages In your system.
Reinstall all packages do as the name suggest.
In Garuda Assistant below you can see
Apply New-Config / Reset to default
If u messed up , above will be usefull in some cases
It's update. So yes. Exception are some cases like recently updating to PacMan 6 made Add/ Remove Software GUI unopenable . So users who know this recommend others to not update.
In rest 99% you should .If it is clashing or may be a potential error casue ,it will notify (read the lines while updating or installing or uninstalling - will be usefull in future for troubleshooting)
I am sorry I can not keep up now.
You say I should always say yes to replace all packages
It then results in many conflicts
When I choose the recommended
It results in an abort
This should not happen right? It's a completely fresh installation
What did others do? Just ignore the abort?
Or is my mirror outdated or trying to mess up with Garudas ecosystem of packages?
I can not know what is custom to Garuda and what replacement will break everything
I would love to get some clear instruction of what is the official intended way