Suggestion list :
Stronghold (250f, 250g) : Castles, towers and town centers fire 25% faster
Nomads (TT 40 → 20sec / 300w, 200g) : Castles, town centers and houses do not lose population when destroyed
Madrasah (TT 30 → 20sec / 250f, 150g) : Monks return 33 gold when killed. Monastery works 50% faster.
Orthodxy (200f, 300g) : Monks +3/+4 armor
The aim of theses changes is giving a real use to UTs we never see. I took up some proposal seen on the forum, and I think they’re good ways to make them more appealing without being game breaker.
Costs could be adjust easily for the balance sake. (the techs are currently underwhelming, but the civs are in a good spot). It could also give some ideas to compensate some eventual minor nerfs to the civs.
Some other UTs might need some changes (Hi Flemish revolution), I focused on this topic on the one we rarely see. Feel free to share if you have other ideas