I would assume they want to factor in startup time as well as IO handling overhead - raw disk IO should be the same given programs are run in the same environment.
I don’t get it, this is not valid JSON.
Popular choices include peertube and MediaGoblin
It’s recommended to install YunoHost on fresh, dedicated systems. It’ll most likely not break anything but it’s best to have backup ready. It is possible to then expose docker containers, but I’d just recommend installing Nextcloud in ynh and transfer the contents over.
GitFS probably