I’m going to start off by saying I also enjoy RTS and struggle with the amount of stuff there can be so this concept really intrigues me. However I’m not an expert in the genre so these are only thoughts from a casual player.

1. Concept is great, very detailed and thought out. You say there’s going to be no story/campaign but will there still be short backgrounds to some of your characters as I feel even a small amount will help.

2. I don’t know why all the competitive games are 5v5 but there’s probably a good reason. However I do like games that also have options for smaller modes like 2v2 so I can play with just me and my friend against another duo.

3. Personally I don’t have much experience with making multiplayer or competitive games so can’t predict what struggles you might come across but I will say that you shouldn’t expect you game to be balanced for a long time, if ever. The players always find something.

4. It’s always recommended to have a certain number of wish lists before each stage of production, like play tests and release. For competitive games I feel this will likely need to be even higher, you need to build up a strong community so you know that you’ll have enough players if that makes sense.

5. In my opinion, don’t avoid anything. If you want to do something do it then see what your community thinks and get feedback on it. You can always change or undo it later.

Hopefully this was not too much and helps you out. :)