This is true, they legit made it clear that they only added Viera to please people who have been begging for them since before HW revealed the Draggos cause this was likely the last chance to please them.
It's a choice to pander to people who just wanted to play dress up with a bun.
IMO it's clear that most times a MMO adds a new race it's more so to fill a gap in their line up and add visual diversity to their product as to attract a larger audience than they currently have. If all they wanted to do was pander to please people already playing the game all they would have to do would be ... make a 3rd Miqote clan with new faces and/ or make a Half Elezen Human that's just a Meddie with Elezen ears, new faces and emotes. It's super easy to pander to the wants of people who just want different pretty spins on basic human design for their anime waifu/ hubs, but it's not really worth the effort or room that it takes up. That's where the problem with Viera come in at, it feels like an addition that doesn't add anything new and now we have to hear everyone wanting more effort tossed their way cause they're a limited race that a ton of people converted to.
This is true, but at least it's a thing that they said and reaffirmed more than once (that they would add new hair to Viera and new manes and faces to Hrothgar). At this rate I think it may just be a 6.0 thing really, but Bozja Hroths have me thinking that it's at least closer than that.
It's not really a matter of half stepping it. Miqote are the only race in this game with non-traditional ear placement and full funtional head stuff and they were in this game from the start.
In order to use the Miqote head system for gear they would have to be in the same spot on the head (YP outright said that). They would also have to not have customization so that they could act like Miqote ears. They could likely make Miqote ears that are up scaled and altered some and translate that into easy to do upscales to a number of hats/ helms but they wouldn't look like what he have.