Why Braille on the Legendary Golems?

People act like using Braille was this amazing cryptic thing. Everything was still in English, and we have a Braille alphabet. We didn't really need to decode much. The Abyssal ruin's code is meant to annoy us.

I'm not sure if Braille should be specifically attributed to the Golems either since the "language" (if we assume Braille is now an ancient language in the games) appears in ruins that seem unrelated to the Golems (e.g., Mt. Ember, Dotted Hole)

The regis write in braille because they cannot see. They since with their dot "eyes" that regigigas put on them when he made them, which are in a style similar to braille.

Nothing in the series suggests they are blind. Just because they don't have eyes typical to what you think eyes should be, does not mean they are blind.