I don't think they should release the software if it isn't ready. Also, the beta access was a perk to the Kickstarter crowd, so beta is locked down for that.
I would like to request a definite pay structure for upgrading/time window to buy old license but all in on the unity release. I've been curious about FG for a long time, but now have to wait a few more months so I feel I get my money's worth out of it (I'm a buy it for life kind of person). I'm tempted to pay for Premium for a month or two so I can play some Pathfinder 2E with some friends, but it seems somewhat wasteful knowing a lifetime license could be around the corner.

