My main machine is a late 2009 27" i7 iMac which I don't even know if compatible with HighSierra but I am first wondering what would I eventually gain off of the switch, I use no particular applications if not some photo editing (Adobe LightRoom for the most part of it) and some other applications which I am sure will be updated if issues arise but what would make me want to upgrade (for sure not Siri!)?
Grazie
Grazie