Is the F-16 worth buying right now?
If you´re a hot shot test pilot, who likes to try out the newest stuff and be a part of the development, then YES.
If you´re a combat pilot who need something that reliably kills your opponent in hostile skies or at Red Flag, then NO.
I think the F-16, as it is now in Early Access is to compare with a bare bones prototype aircraft early in the test program. It flies, but is not ready for war.
The Hornet on the other hand, while still in Early Access, is like an operational fighter that is quite capable, but not yet at its full potential.
Even in the real world capabilities are added to an aircraft through out its service life. Stuff that was meant to be included from the start might take a few years to be completed due to various reasons.
Viggen aficionados like to point out that the JA 37D was in many ways more capable than the JAS 39A Gripen that was supposed to replace it.