I liked this one a lot. I proposed a similar bonus for a new hypothetical one trick infantry civ like Goths. You can see the civ proposal here
I proposed all eco techs are 100% faster. Yours one is probably stronger as loom will also give half villager lead and potentially Town Watch and Town Patrol will also help. As a Goth player researching those 2 LOS increasing techs are pretty useful as your defense options are pretty limited.
Any early game bonus should come up with a Perfusion change. I think with your proposal, we need even smaller value like 66% or 50%.