Variation in the link profile is probably overlooked a lot by SEO’s. Relevance is important, but *some* links from irrelevant sites, as long as they are not totally off-topic can be good to appear natural.

How many people would naturally link to a page using optimised keywords, they actually in the main would use phrases such as “here”, “this article” or “this site” or the domain name which is not great for keyword rankings but is what Google will expect?