I'm not pointing about any users, but there are a few I know that like bolding things in questions. Is there a specific reason to do this?

Readability is the largest reason I have heard. However, I do not see a good reason to do this. The edits to seem trivial and do not really add anything to the post.

What is the etiquette for bolding stuff?

Bolding/Italicizing I've noticed:

• (B) Question in post

• (B) Info in post

• (I) Info in post

• (I) Tech specs

While these seem to be good things to post, they already stand out quite a bit. Why emphacize it even more? Also, this kind of allows people to not read by ONLY looking for the bold bits. As a result, a lot of important details are missed. And as such, the answers don't help. Quality of answers goes down. And because answers aren't good, the questions will become fewer. With fewer questions, AU won't be the same!