I think the main issue is, that they dont have any ranged option between feudal and late castle age. Going for archers is a no-go since they are a dead end. Even to counter infantry you have better options with your own m@a with some ressources/time saved in the upgrade to make more numbers.
Without archers though they cant use one of their biggest bonus = faster researching blacksmiths to gain momentum, since you dont research anything else in the blacksmith in feudal except archer upgrades. In scout or m@a war those dont matter really since there numbers >> upgrades. And when you research upgrades during aging up between feudal and castle it doesnt matter how fast you need for those since you avoid battles anyhow to get your other upgrades also. And that means you use your bonus also only at beginning of castle age. So the only thing Bulgs have is to do m@a towers in dark age feudal something that has been nerfed with DE and is possibly one of the worst feudal openings and so one-dimensional everyone sees it coming.
They need feudal archers, since they cant do xbow but have no ranged option unlike their buddy civ spanish. Xbow isnt added since it would make their archers too strong. They would have xbow with thumbring and bracer, somethign that the other similiar civs dont have like: Aztecs, Teutons, celts, Slavs but Bulgarians already are stronger in the cavalry and CA department compared to those. I can see that these would hurt their siege, cav infantry identity too much.
So they need a motivation to use feudal archers but they should not end with Xbow but rather CAâŠ
If only the civ had the unique ability to mount and unmount horses and have even brought the stirrups to europe to make mounting easier so, you know what I mean
â â â â â â â â lets go ham and let Bulgarian archers be mounted in the krepost (maybe only after stirrups, but could be too late) for +15w/+15g per unit and no additional traning time.
You know that problem you are a civ with steppe heritage and desperately want to make Cavalry archer, but your feudal archers just dont cant get on that freaking horse. And training people that can get on horses is so expansive and they need so long to learn the ability you can only make very few of them early on.Here is the solution. Stirrups help every nooby being trained to shoot silly arrows to get on that horse. Stirrups so easy yet so effectful. Stirrups now also in your city.
You have bunch of hurt units from feudal wars, why not make them CA and they are insta healed for a little fee we want to have for that. Imagine what fun you can have with CA when you can mass them in feudal already Nobody would claim anymore that CA are bad if you have 20 in mid castle age already Man that would be so fun
And that is what Bulgarians lack. Fun, they are just the most boring civ in the game on any map. And that needs to be changed with top priority so that they are used again.
And if it is too strong, you introduced enough new parameters to balance it out.