I’m not going to grant that, given how hard it is to utilize multiple units in feudal even if the upgrades are cheaper. It’s expensive to put down the buildings to go scout skirm or M@A archers, and that expense is not shorted by the Bulgarians, but let’s run with it.
If you pick up Fletching, forging, and scale barding, the three most expensive techs from the Blacksmith and add up the savings, you’ll have saved 200 food, or effectively gained 1 villager worth’s of gathering food for ~10 minutes on Sheep. (it’ll be 8 for a faster source, but we’ll run with it.)
That’s not really comparable to a “good” economic bonus like the Britons, the Mongols, the Chinese, the Mayans, etc. So we’ll try to find someone similar to compare it to… Aha! The Japanese have a camp discount, where they get to make mills/camps for 50 less wood. Assume you make one of each, at 50 wood apiece that saves you 150 wood, fifty less than the Bulgarians save in food… starting at least a full six minutes earlier. So even against an objectively weak land-only eco bonus that the civ doesn’t even get picked for and assuming the minimum benefit you would very easily make the argument that this is a vastly superior eco bonus.
Would you like to argue the Bulgarians have a good economy in a different way, or are we done on this tangent?
P.S.
Right, let’s be specific, because details are important and I like to be thorough.
Villagers gather wood faster than food, which is a reasonable question as to whether or not the Japanese bonus is actually better. Villagers gather just under 24 wood per minute. So let’s look at it this way. You’ll go for your lumber camp usually at villager 7. That means it’s been 100 seconds before the bonus kicks in, at which point you’ve saved 50 wood, or, just over two minutes of work time. At villager 10/11, you drop the mill, and again, two minutes of work time. So I’d argue, with this largely ignored eco bonus, you’re effectively a villager ahead for the first four minutes of the game without doing anything. I quantify that as being strictly better than getting that discount (which I can then use) in the middle of Feudal. It’s arguable, I guess.
Count in free Man-At-Arms, and if the Bulgarians are able to make use of that window, it’s certainly better than the Japanese eco bonus on land. No argument. But then it does require you to play well and to actually take advantage of that timing, so it should be better than the bonus that comes from dropping a camp in dark age.