It was about different running costs for different ships based on whether they were in game called high performance or not
I can understand that these 'mechanics' (personally, I'd just call them things) could be used to make ship choice more involved. I wonder though whether FD really want to put more things in the way of the player using the content of the game that they want to. Players tend to want it all in this game (hence that there are ships referred to as 'endgame'), and there are none (or few) of the trade-offs required when outfitting ships in ED, especially when you add engineers into the mix, that were a feature of the earlier games.
To me, other than the silent running part of the OP, none of the other things really add to gameplay, I don't see how credit sinks could. I'm all for more depth in decision making, but I think I'd rather see it directed towards things like system security levels actually being important when determining risk and mission rankings being a much more realistic guide to the level of challenge to be faced.