I’ve put the data dir on an nfs mount - didn’t have any problems with it. I’m pretty active with it too - hundreds of gigs, updates daily, run for 5ish years.

why bother to set up NFS at all?

It’s a NAS…

Sorta. If the log file is open then your rm won’t take effect until the application closes the file. You won’t see the file anymore but it will still be taking up space. So if nginx is running when you delete the logs you may need to either stop it or restart it depending on how nginx handles this.