In chess if you don't play 2 years and then come back to it, you don't find out that all the rules have changed in the meanwhile. Which is what currently happens with age of empires 2.
I thought about almost this exact thing recently. I hope we're able to keep the best games running forever.
For games that are fun I think you can leave in balance issues and even features-not-bugs. It's trickier for things like netcode bugs that are purely a negative.
Really grateful Id release their source eventually. Really hoping the same will happen for AoE2 someday.
It's a brilliant game for sure. The randomness, the fact that it's not turned-based and the multiplayer also make it interesting compared to chess.
However Chess has 1000x simpler rules that never change, and you don't need high APM to play competitively.