As someone else who listens to a lot of metal, you’re not wrong, but I will say the reason the best metal bands are considered the best has a lot to do with how relatable their lyrics are and the general tone/message of empowerment that come with them. But at the same time, I listen to bands who sing in languages I don’t speak, and then go look up what they’re about later to enrich the experience. But there IS a strong argument there toward lyrical ambivalence being a prevailing factor in liking the music to begin with