Let me introduce you to Tiberian Sun: Tech Level War. It's a mod with a new gameplay tweak, in which you have to build very expensive buildings - the tech centers - in order to level up and have superior buildings and structures and eventually win the battle. However, there are not useless units in the lower tiers.
Nothing new, this is a pack that includes the mod version 0.3 along with the patch 0.31, there's no need to download it if you already have those two packs.
"- Now the AI doesn't build Stealth Generators nor Obelisks at the start of the game."
0_o That would suck...