I am not talking about kickstarter obligations (those mostly ended at point of product release - I thought I made that clear with my reference to the DDFs being mostly moot) but the obligations to existing users of the released product (c/f compliance with Trading Standards and similar regulations), arguably removing the BDS/IDS/ADS functionality could be considered a breech of those obligations (and their own guideline/rule of building on the past), especially given both the nature of the replacement mechanics and the length of time the prior mechanics were in play - the placeholder argument loses all legitimacy at that point. Plus there is the point that FD seem to be resistant and/or dismissive of suggested improvements which arguably are necessary to meet their obligations - and I am not necessarily talking about reviving the BDS/IDS/ADS mechanics either.
Ultimately, the overriding point is that the introduction of the FSS/DSS failed to hit the point of acceptable compromise. It adversely affects the in-game experience for at least some with no acceptable alternate mechanic.
I apologise to OP for this slight derail and would like to make clear it is not my intention to start a new FSS debate.
I think saying “arguably removing the BDS/IDS/ADS functionality could be considered a breech of those obligations”, would be fantastically difficult to argue.
Put aside for one moment whether you like the FSS or not.
Does it allow you to search a system? Yes.
Has the introduction of it caused the game to be unplayable for reasons such as it always causes the game to crash? No.
So as cumbersome, ugly, inefficient as some may find it, it still performs the task required of it and has not caused the game to cease working.
That you might not like it is not going to be a breach of terms.