Posting on blogs, forums and articles is beneficial to your SEO strategy only when done with the idea of providing value in mind.

If you are just posting just to get more backlinks for your site, then that is where you are going wrong and why you feel that is it not right move. However, if you are posting to add another point of view to the conversation or to provide helpful information, then commenting is a great strategy to use.

The right way to use comments to use them only on topics that you have an in-depth knowledge of. Otherwise the comments may come across as "me-too" or irrelevant to the conversation.

There are additional benefits in terms of content marketing for using such comments. I would be happy to discuss this with you during a call.