Is there an endgame? I never noticed
As the beta runs with a snapshot of one's CMDR from 18th November (in the notes) buying, in your example, AX weaponry is still possible - even unlocking Guardian modules can be done in a couple of hours, where is the issue, apart from using some playtime to do something to check out another thing that one may not even had been considering?
Fine, the beta is likely to be a 'waste of time' as nothing is being done to allow 'painless upgrades' with all modules/ships being available for perhaps fish... but is opt-in... regardless of the 'limitations' not being relaxed, I, for one, will jump in and play - both my CMDRS on 18th were low on credits and not necessarily in the best of positions, but at least joining in will see just 'what' may have been 'fixed'.
Expend the effort you are happy with, should you join the beta, I will