Goths don’t need a buff
Yeah they lose vs other infantry but that shouldn’t be an issue if you actually lean into their bonuses
When you attack, off a half decent economy you’re able to field a virtually endless army because of how cheap it is to make as goths. Lean into their bonuses. Obviously you’re going to lose in pitched battles against better infantry civs (ignoring the fact that they get hand cannon) but that’s not an issue because you can produce double the amount of units that they can with the same economy. It’s never about winning one big fight, it’s about the follow up, and once you’re in a half decent position with goths you have infinite army. Goths are basically unkillable in imperial age after perfusion unless you’re already killing them.
If you’re fighting with equal numbers as goths, then you’re doing something wrong.