User blog comment:Blappp/AoE II Tech Tree revamp/@comment-27198062-20170205145943/@comment-31031245-20170205153848

IMO, changelogs should remain, so that a player can connect changes to units by patch, and also in order to keep track of tech changes and eco bonuses, while connecting them to related techs.

I agree though that the introduction is a bit chaotic though..