If you need one, get the bundle. Maybe cheaper for some than an update, or if your license expired a good way to get a new one.
(and a second license would give you a second account and more voting power on the Feedback app)
I already got one and recommended it to a couple of friends. For $20 instead of $300, this is a good chance to take a look into Xojo.
PS: And remember: Even for a Mac bundle, a Desktop license covers Mac, Windows and Linux.