I don't believe that "Vox Populi Vox Dei". Up to now Toady has delivered the game that can be the game I always dreamt of. Assassins Creed wasn't the game it could be to appeal to most people possible. Every change he makes divides the fanbase. I can't think in one single change we universally agreed was bad. (There is the Arsenal Dwarf, but I think it was removed because it was bugged - the concept was pretty cool)
In short, Trust in the Toad.
If Toady truly didn't care what people thought, why would there have been an Eternal Suggestion Voting, with the top ten winners being put on the devpage to be worked on after he was done with Caravan Arc stuff?
Why is it that after the outcry from some corners of the forums, Toady went ahead and announced putting in the init option for the super-abundant stone of previous versions? That was a direct bow to pressure.
We're getting random animals put into the game based upon what animals people sponsored right now.
The taverns we are soon going to get and the caverns we have had since the start of 31.x started as suggestions.
This isn't a "sit down and shut up, you'll get what you're getting, and you're going to like it" kind of operation.
Now, I don't mind the mineral scarcity, even though it's wonky, but I know why it's there, and didn't like the previous 31.x overabundance, and hope that it will improve, but the ability to know what it is you are embarking on is a very fair thing to ask, and it was something that was brought up by many people at the time.
Not telling people what they are embarking on doesn't "make the game exciting", it just makes you dig down to find out what metal you are on top of, and if it isn't what you like, you abandon and try again. Embarking on a glacier is a nice challenge, or embarking on a place where you know there are NO metals and an evil biome is a nice challenge - but you know what you are getting into when you pick that. You know what site you want, and you're getting it.
In 40d, there weren't subterranean rivers or chasms or volcanos or sand in every embark, but you would be able to know when you found one, and know when you didn't if you so chose to look. A great many people would try to embark once on a place with everything on it (Dwarf Heaven), just to see all the features, but would generally settle down on evil biomes or glaciers or the like.
In the current model, maybe you are going to be dissapointed by how EASY the game is with readily available iron and flux and coal all in one place, and have to abandon because of that...
Basically, there is no real game benefit to the choice (especially if Toady just puts in an init option to turn it off if you really don't want it), but a major game cost to the choice in terms of frustration to some of the players who are looking for specific things. As a game developer, that's just not a wise choice.