I can infer IndigoWyrd, and so can you if you look. The released 3.3 version of the game works in a certain way. How the things are achieved isn't important, what is clear is that the functionality is still in the game.
Frontier as a profit making company don't need to justify anything to anyone but their shareholders, who will not want money to be spent in ways that do not contribute to the bottom line. This is what I mean when I say there was no financial benefit.
I think you have a different understanding of what 'Retro' means to most.
Your justifications:
1. People already out cannot fit one - this is true. Had this oversight been caught & addressed sooner this would not be an issue of course, but making the ADS module available in outfitting would mean that those who wished to could fit one just as they can optionally fit an AFMU or a refinery and mining laser.
2. Enabling - I don't see correcting an oversight as enabling, but at this stage it's just another proposal. Normally FDev would not end up having to re-introduce something because they would have done their utmost to avoid inconveniencing any players when there is no balancing issue and there is no balancing issue here.
3. ADS not compatible - just play the game and you will see that it is. I have posted a video demonstrating that the complete functionality of an ADS is retained in any system that you have not visited before but that has already been fully tagged by another player.
If you want to go on for several pages with justifications on why my proposal should not be implemented I would very much prefer that you do that in the appropriate thread (my proposal thread now, the other one actually requesting objections was closed). Many others have put forward their thoughts and have not been able to provide justification beyond those stated in the OP of the now closed thread. It is linked to a few pages back if you want some ideas.
This thread is about whether people like the new stuff or not, and my proposal is intended to be satisfactory to both sides of the argument. You are objecting to a solution that satisfied all players, seemingly on the basis that because it was not done there must be a reason. It wasn't done because it was overlooked until it was too late, that's all