It's a pvp right and you can kill other players using better weapons and ships
Are you planning on playing the game as much as humanly possible from the starting point, maybe together with some friends at the same level? It doesn't matter the day of the week, you are there, playing, do you want to put that much time and focus in the game? Because that's the only way I see a problem with players starting with different stuff. Is not War Thunder or other game in which you go stupidly head on, with the only purpose of killing each other.
Even if you all start with the same resources, 2 players working together will get access faster than you to a bigger, better ship or better weapons and destroy you. Isn't that the same thing?
This is not GTA 5 where everyone can kill everyone, but in the world of that game, imagine that if someone will kill you, all the cops plus other NPCs plus possible other players will come for the attacker. Trolls won't last long and neither will pirates in well secured areas.
Ergo, you can start small and get to the upper tiers by your own work. Frankly, I think it will be
far more entertaining to start from the bottom and climb the socioeconomic stair of the game. I have myself a 300A, but most likely will keep it as backup and try my luck with an Aurora just because of the fun part, of that rewarding feeling you get as you progress.
And that's the MP part, Squadron 42 will be a different thing, an experiences in itself.