Is there a reason why we are applying this to Gauls instead of Brits? I only ask because Gauls already has some nice bonuses while Brits doesn’t.
It's such a generic bonus that it can be justified for basically any civ, Gauls were just the first ones I thought of.
Also, this wood tech paired with Gauls’ food tech makes Gauls the best wood/food civ on the game by quite a bit.
I suppose the bigger problem is that there isn't really a design plan/idea for how the civs should play and how many bonuses, unique techs a civ should have. So I'd imagine the celts having an eco advantage which transfers to a numbers advantage to make up for inferior unit quality, but obviously, that's not the case currently so it would make sense then to switch this over to the Britons. Then they'll have an eco bonus and their unique tech, unlike the Gauls, could be military focused and the Gauls can just receive a different eco bonus later.