I am in two minds about this, and I'll wait to see how it pans out before deciding how I feel about it all.
On the one hand, I despise micro transactions and pay-to-win games, but at the same time I don't necessarily see these pre-built ships as a way to cheat one's way through the game.
ED is first of all a game of skill, and if you put a big, powerful or fully equipped ship in the hands of someone who does not know how to fly it, it's going to be a poor show anyway.
Posts of people who have rushed through an Anaconda, only to fail at getting out of the shipyard are very frequent.
A prebuilt AX Chieftain? I wonder how many attempts, (free) rebuys and trips back to the fighting area will take for someone who just jumps into it because they now can.
If anything, it might have the opposite effect, of people complaining of having spent real money to be a sitting duck and ragequitting.
In a game like NMS, where the normal difficulty involves keeping one key pressed until you win, or having to press two keys at the same time when it becomes really hard, a P2W scheme could be perhaps more detrimental, but in ED I am not so sure (not yet, at least), you can't buy skills.
I keep thinking of the friend of mine who introduced me to ED: he's so passionate about it but, due to family commitments, he's never able to log on for long, and sometimes has to be away for months. When we manage to play together, there's not much he can do, even though he knows what needs to be done (and I have helped him a lot).
This thing about pre-built ships is something that could help him have more enjoyable sessions with me, when he has the chance to log on.