Reason for change: The list is no longer a generalist list, and that is a primary goal for a core army list.
Complaints and lack thereof: Of course there have been few complaints. The changes did almost nothing to change the tourney/power-gamer list composition. If no one is playing alternative styles (and it's obvious from the batreps and tourney lists that they aren't) then there won't be complaints.
Playtesting: This is a red herring. Loosening it would not be a major change, and there are literally years of games with looser restrictions to look to. As long as you don't flip it back so far it is even looser than the official list, playtesting on a large scale is not required. This is not starting over as has been implied.
Keeping a retinue core as a signature character of the list: A reasonable goal, but as you pointed out, nearly all lists prior to the changes had 2-3 retinues. That probably means it is not a problem to build that requirement in, but the flip side is that forcing people to take them is unnecessary to achieve this goal.
Forcing strategic choices: The primary strategic choice you are claiming this list revision creates is based on the selection of the 3 Elite formations out of ~10 formations in the army. The claim that 3 formations is sufficient to control the strategic character of the entire army is a very tall claim and it deserves elaboration and support.
Also, it is worth examining how the intended scout-termie-WE "forced choice" works. The reason it is a forced choice is because the Elite choices are seemingly always maxed out to make a viable army. That means as a group they are the "no brainer" choice.
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- mechanised - retinues in rhinos, scouts in rhinos or decimators, armour
I didn't really want to get into the details, but since you keep going there... mechanized infantry might be workable within certain restrictions, but there are no batreps to support it. If it really works, then the mech infantry is an expensive core formation because the only way it can reasonably expect to remain mobile is to use at least one LR, probably 2. That expense requires the player to max out Elite formations that can pad activations, exactly as you note - Chosen and Decimators.
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- drop
The assertion that this is viable is unsupportable. There are no batreps of a successful drop force using the BL list. The only batreps I know of were frogbear's and they were all losses. It should be obvious from theoryhammer as to why - the maximum drop/deepstrike in the list is ~2000 points (only to be reached by maxing out elite formations). That requires split forces and maxing out the allies allotment on War Engines so they can survive to link up.
Also, if you're making a case about supporting different playstyles, that's pretty much the same as the stock power build. Obviously, deployment makes a difference in play but once it's on the ground it's the same list.
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- foot slogging
Again, not one batrep supports this being viable. The restrictions cut into key elements of an infantry line force. There are limited scouts and heavy hitters, so even in theoryhammer world it requires maxing out Elite formations.
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The only real change is that you cannot go all-armour, which IMO is not a significant issue.
The changes seriously impact other play styles as above.
Also, you neglected a fast attack style. The option you proposed above (Mech Retinue + Mech Chosen + 2 Bikes/Raptors) relies on maxing out every available support slot so there is no way to build in any other elements, e.g. the mobile fire support so critical to a fast attack force comes out of the same allotment as the fast attack so you can't have both. Even if it could work, it has as many foot infantry as fast attack units so it's as much mech infantry as fast attack.
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If you have any examples of alternate play styles being employed successfully, by all means provide them.
Maybe there was some testing of alternative play styles in the EUK process, but from what I've seen of that process, the primary goal is making sure the lists are not overpowered in the UK tourney scene. Alternate play styles are not important, just balanced tourney fights. I would be willing to bet that the testing was all geared solely towards the power-build armies.
That's not to bash on EUK. That is their stated goal and they do a fine job of it. It does, however, limit the applicability of their tests and make me doubt that there is an untapped reservoir of information out there.