I've written about this couple times in Steam forums and here, but wanted to start a new thread in hopes of starting some serious discussion around the issue. Apologies for mostly just copy pasting what I've written before, but I think it kind of gets the message across. Also, if you've read the comments before, you can just skip to posting your reply 
From Steam forums:
I've never really understood why people want gazillion races and units in a strategy game. Intelligent strategic decisions require you to know what you are against. More races just means that you have more knowledge to be absorbed before you can even get into the pure strategic gameplay. Before you have all the necessary knowledge (basically know the rules), it's more about stacking your knowledge of the games races and units against the opponent's. Basically being lucky to throw the units at the opponent that he doesn't know enough about to effectively counter them.
Chess, arguably one of the greatest strategy games ever designed, has one race, six units, and every unit can basically only do one or two things. Anyone can learn the rules (including the units) in 60 seconds, and after that it's pure strategy. And even with just that minimal ruleset, players have pretty much unlimited amount of strategic options during a match.
I would actually like to see the ranked 1v1 to be made PHC only. Having to pick a race, therefore somewhat choosing your strategy, before you even know the map or your opponent, is just guess work. By having only one race the knowledge required to be competitive would be lowered, which would hopefully encourage more of the singleplayer only crowd to join. Additionally the endless debate of balance and the endless effort required to achieve it would be put to rest. Often the imbalance between the races actually limits the viable strategic options each race has when facing one of the others. If your race happens to be weaker at air superiority, it's basically one less strategic option you have - Regardless if it's technically possible.
However, when the game gets rid of the necessity to painfully balance the races for a 1v1 matchup, additional races could be made significantly different. If there would ever be 2v2, 3v3, or 4v4 ladders or tournaments, I would probably allow one of the special races for each side. Maybe not in 2v2s though, and maybe two in 4v4s or bigger games. In such matches the vastly different races would serve a specific role, and it would be up to the teams to effectively utilize their strengths (imbalance). Competitive 1+n vs 1+n games are way different and more difficult to perfect than 1v1s anyway, so I think the additional knowledge requirement would be fine.
From the Avatar thread:
I think RTS should first and fore most be about strategic decisions. Well, you can't really make strategic decisions before you have the knowledge of all the rules of the game. Which in the case of an RTS, among other things, means knowing all the units and abilities involved. It looks like Substrate is so different from PHC, that the knowledge you acquire by playing PHC, gives you almost no hints on how to play against Substrate. Only way to be able to strategically play against Substrate (as a PHC player) is to go and tediously study the race beforehand. That's a bit bad game design.
To summarize, making ranked 1v1 games one race only and having limited slots for other races in larger matches would:
1. Get rid of any balance issues and the poisonous effect they have on the community.
2. Increase the viable strategic options in asymmetric (race x vs race y) matches.
3. Cut down the amount of knowledge required to be competitive in asymmetric matches and to get to the enjoyment of strategic gameplay.
4. Allow devs to put the balance effort into other issues, making the game better overall.
5. Allow other races to be DLCs without making people yell "pay-to-win".
6. Allow other races to be vastly different, allowing more intersting lore, and adding interesting aspect to larger MP matches.
As the second season is starting, this would be the time, probably the only possible time, to make this change.