5 years ago I'd say that it's a good way to ascertain topical relevance of an article or webpage.
Gone are those days, don't concentrate on the
<strong> tag if you're trying to use it for SEO as it won't make the blindest bit of difference. Concentrate on good quality writing and relevant
<H2> tags instead.
SEO has changed so much even since last year that you don't even need the actual keywords in your webpage any more to rank for the keywords, and that's the truth.