As unpopular as it might be I think he's got a point about this too. it's just that it's not very clearly articulated.
At the end of the day, customers and others browsing your site are unlikely to understand why there's no visual indication on their mac, and why you didn't put one on your site.Sooo.. if you're forced to put a visual indicator, at the very least least, make it vertical for page scrolling.
They either need to learn how to use their macs or switch to Windows. Fixing ignorant OSX users expectations isn't and shouldn't be a webdev's problem.
At the end of the day, customers and others browsing your site are unlikely to understand why there's no visual indication on their mac, and why you didn't put one on your site.Sooo.. if you're forced to put a visual indicator, at the very least least, make it vertical for page scrolling.
(and also, thanks for nothing, Apple UI)