Arre you talking about 1-word searches? If it's a multi-word phrase, then inanchor:kw1 kw2 only requires kw1 to be in the anchor, and inanchor:"kw1 kw2" with quotes should be identical to allinanchor:kw1 kw2
But neither special operator can parallel regular search results very well, because top ranked pages do not need to have the keyword in the anchor text at all, even though it is quite common.
"..top ranked pages do not need to have the keyword in the anchor text at all.."
Interesting statement T, during the summer I had a look at "web design" in the "pages from" results of the various English language Gs mostly to look at regionality.
Normal search results did show pages that didn't feature top 20 in the allinanchor results for "web design" but they invariably were top 3 in allinanchor for closely related terms such as "website design" or "web development".
Not sure what if any significance there is to this but when I allinanchor a two word term only the words appearing in the url are bolded, when I inanchor it the words appearing in the title and description are also bolded.