In Google Apps Domain Management, There is a page for me to change how my naked domain
http://example.com is redirected.
However, in that page, it tells me You must change the A-record at your domain host for this change to take effect.
Now if I have to change the A-records in my domain host manually, why do I still need to access this page for?
If I change the A-records in my domain host manually, everything will work fine just as a usual non-Google domain setup process isn't it?
So what's the purpose of that form at all?