Units don't destroy trees when walking over them. Their colvol is pretty big, so units can just hide inside them. Needs a fix.

This map seems quite popular, should it be featured?

I personally don't like the dunes either. They really mess with visibility. The map seems to be popular in votes though, so I'm wondering if there are some strong supporters of it.

The dune gameplay is terrible, and I know some other players who agree. I do like making a shipyard in that center pond though.

Someone tell me the actual difference between a Featured and a Supported map.

That doesn't quite answer my question. You've written something that could guide the humans designing and implementing a featured/supported system, and broadly, I agree with the distinction you wrote. However, the system is already designed and running. The design goals that we hold may have drifted significantly in practice as multiple people work on the same system.

Players don't care much about the theoretical distinction between featured and supported. They just care about the kinds of maps that they are automatically presented with or able to manually pick in various situations. The map tags are mostly internal features, the various map selection systems are the primary user-facing systems in this area.

As I understand it, when DeinFreund added supported maps to the endgame map poll he removed the most important practical distinctions between the featured and supported tags. With this state of knowledge I have trouble answering the question "should it be featured?" because such a question seems vacuous - I don't think it will have any effect on the experience of players. That is why my question would be better phrased "What is the technical distinction between Featured and Supported?".

I also don't know what the current poll actually means, although I can see it is meant to be some sort of popularity contest.

There has been overwhelming feedback from other admins that players don't know which maps are good. Thus I'll probably be changing the map polls at the end of each game to only show featured maps. Before doing so, I'd like some more maps to be featured. This is because I'm of the same opinion as Jasper, thinking that the current featured map pool is too arbitrary and not a representation of a popular (big teams) map pool.

In the original implementation, multi-option map polls were showing supported maps because they were intended to completely replace map polls. Most of the time, there's no chance to call manual map polls. I didn't want to rob players of the ability to choose supported maps with a UI change, so I added them to the options.

The map poll currently displays two popular maps, chosen randomly from the top 20% highest rated maps, as well as two random supported maps. This could be changed to only featured maps. I agree that this makes sense category-wise, as otherwise there's no real distinction between featured and supported.
[Spoiler]

If you have a look at the highest rated maps, you'll see that there are quite a few non-featured maps in there. I feel like there are not enough arguments to warrant many of those to be effectively unavailable in teams host.

The map ladders are generated from the results of multi-option map polls. Each poll is treated as a 4 way FFA with one winner. Maps are scored using Bayesian Elo. There has only been a very small sample set until now (many maps were only in a single vote) so don't take this too seriously.