Guild Wars 2 on Mac
Have a look at the technical support section of the forum: It’s plenty of Mac threads: https://forum-en.gw2archive.eu/forum/support/support
As for the Beta thing, it’s like this:
GW2 has had a Cider-Wrapped 32bit client for years, which got worse by the time. Don’t expect major support for this.
They are now developing a native 64bit client, you can already use it and play with it but it comes with it’s share of issues too. The main focus for Mac is the new one.