I've ranked quite a few sites with variations of this exact technique, so I'm not quite sure where the idea that these links won't benefit you is coming from. I absolutely respect your opinion though and do agree that reaching out to influencers and engaging them is a big big deal.

This strategy is simply a component of an overall outreach and SEO campaign for any product. It very much needs to be mixed in with a variety of other techniques for full success.

The reason I shared it was because once you spend the hour or so to set everything up, you can sit down each day with your cup of coffee and spend 15 minutes building some links while interacting with the community in a very easy way. Mix that in with more specific outreach and you have a good strategy for growing exposure to your product.