Perhaps a better way of suggesting it is what are you willing to give up to get the things you want? If they have a set amount of work they are capable of doing then something has to be given up for new things to be developed. Game development generally seems to be 'try and squeeze in as much as we can within the deadline we have'. This is the very reason they had to give us only 2 dungeons instead of three so they could work on the Sky Island Exploration. And to be fair to other players, make it something you actually value in game since dumping something you don't care about is just being unfair to other players.
Effort can sometimes mean the actual benefits are outweighed by the amount of time and resources implementing it would take or in other cases its something that takes a lot of time to work on without a certainty it will actually work. Most developers have learned to be very careful what they talk about, particularly in detail, as players have a tendency to take everything as promises.
As for difficulty, some times it is simply technical. Many of the inventory issues are tied to there server structure and its backup system. Sometimes it has to do with managing game balance. I suspect one of the reasons often dungeon gear is undyeable is so they can add it as dyeable crafted sets later on. This makes sense because they want the items to be worth creating and they don't have the resources to create entirely unique sets for crafting every time.
I've also said this before but unless we assume that Yoshi P is always lying to us, which is pretty damn paranoid, much of the Cash Shop revenue goes back into the game. Didn't they say that the Cash Shop was originally implemented as a way for them to finance the EU datacentres? That's not to say that what goes into the Cash Shop shouldn't be scrutinised but its not like they are only adding things to the Cash shop. The Cash shop is getting 1 new wig and outfit that we know of, while the patch is adding 4 new hairstyles for each gender and a plethora of new gear sets. Shrinking the games income stream isn't going to get us the extra things we want. For our sub we get good value, certainly compared to what the norm is in the MMO industry today. Further, its distinctly possible that the resources used to create the stuff that goes into the Cash Shop never would have existed without it meaning they may never have been available in the first place anyway.
Finally, on the topic of the OP, I think it's safe to say it a general consensus among players that the disparity among male and female gear is an issue. We know they have at least noticed and its important to continue to make our voice known but lets try to keep a non hostile tone and the conspiracy theories to a minimum. This stuff doesn't get changed overnight. It will likely take months and potentially several patches to right.
Most game developers do game development because it is a passion when they could make a lot more money in other private sector areas. They work their asses off. Lets try and remember that and try to be a bit respectful about it. Too often discussions like this devolve into Angry Mob bitterness which doesn't help anyone.