CondoMeeeif ur curious about how the average person views tf2, check out /r/tf2Why does it matter that its different?
Because it's TF2
Mechanically 6es is one of the few fps games with quake style dm (although obviously its a lot slower) that doesn't follow quake's gamemodes and weapons/armour pickup system really closely. 5cp isn't something that's in other games, nor is uber advantage. It's something pretty new and I think with the potential for weapons being changed it can have a shifting meta in the same way that mobas do which is something that would also attract a different playerbase.
Unfortunately for Valve to switch their focus to it to a degree they'd make something actually sucessful, then they'd have to stop focusing on other stuff in the game and other games that they currently make (as tf2 is pretty low maintenance for them right now) lose out on a huge amount of potential money for a risk which might not work out.
If tf2 didn't exist and Valve made 6es as a game designed for that format from the offset right now it could probably be very successful in the current climate as it does do some pretty different things.
However, Valve doesn't need to turn the game into anything big as far as this thread goes, all this is asking for is a button as a piece of goodwill. It's basically like Valve saying hey this community has done a ton to make this cool promod go check it out. That doesn't sound particularly unreasonable to me, especially as it's not going to lose them any money as it's not actually competing with anything valve wants to do.
Unless Valve wants to make their own competitive mode there's not any point in them actively snubbing the community of it, and tbh I don't think they're deliberately doing that. They're just a company that's famously shit at communicating with its customers.