Thanks for the responses, it's why I'm asking, as I genuinely don't get it.
I think my view stems from the days of having to re-install my windows workstation every 6-12 months in order to regain decent performance, so moving as much as I can to be on a 'different host' (usually a local linux server) to minimise the pain of backups/restores when rebuilding the workstation.
Cheers!