First of all thank you for your feed back!
To get to your questions:
You're right. But our intention was the general style preference. Some people like realistic graphics more than stylized and some like 2D more other don't care at all.
Currently we don't have any fixed features. We just talked about it and wanted user feedback. To give you a small outline what were thinking about: social features, shop, auction house, pre game organization (like making a deck in Battle Forge to give this thread some Skyloards Reborn flavor), some mini games for daily rewards, etc.
Yeah I thought about that one too. In the end I removed it because in my opinion its kinda a combination of multiple factors. (Collecting, Challenges, even competitive multiplayer gameplay and so on)
Yes Steam is kinda the big mothership here and its almost a shame that some games get the updated etc. We would probably handle this by a custom launcher updating all clients to the same (offline play would be possible) but on the other hand I personally often find these launcher to be annoying. Anyway nothing is set to stone right now.
Little list what we account under that point: Skins, Loot boxes, exp boosts, ingame currency boosts, profile pictures, custom voice lines, custom animations for idle, taunt, dance.
Alright I hope I have answered all of you questions^^
Have a nice Day,