I wouldn't say it is harmful (just like that). If you do you would have to apply the same to all tradition as repeating things regardless of whether you know the benefits of it.

In the past, tradition was one of ways to pass knowledge. There was no youtube or google available and people were generally were not able to read or attend classes.

Even today you teach your kids certain things they just have to do before they can have knowledge of why. For example brush their teeth.

Even then, repeating things like that is still one of the ways we cope with complexity of the world around you.

I am certain you are probably repeating some instructions from somebody on how to do something just because there is no time in the world for you to evaluate every single simple thing and decision.

On the other hand if somebody starts writing about it and discuss with other people, I expect them to put at least a little bit of effort into thinking about it if you are equipped for it (or shut up if you are not).

Repeating mindlessly on the Internet things you learned from somebody else is one way the world is broken today.