I find bold characters hard to remember too. I don’t use Bunpro for vocabulary learning so I haven’t noticed here. But I’ve had to modify Anki templates to make the kanji less bold
And I know it’s fairly common because I saw discussions about that in the Migaku Discord
I guess it has to do with how many kanjis are similar to each other and when you are learning them, being able to distinguish them is important. If the text is too bold, the strokes tend to blend with each other which makes it harder to notice the little differences and details



(unless it’s already somewhere, n we just can’t see it
)




