Why using old engine?

Hello Blizzard team,
I fear that there won’t be further improvements like latency improvements, pathfinding or other useful modern improvements because the game is built with the same old engine. Also, I think the graphic which you presented at Blizzcon is not 2018 worthy and TBH it did not give me Warcraft 3 feeling at all.
Please, consider to give us network improvements so we actually can play Warcraft 3 with a small delay. The current BNet delay state is not what I could enjoy and I fear, if you try to connect the classic game with the remastered version, that this never will change.
Regards

Rumor has it, some of the hardworking artists are learning Java Script! It might happen LOL