With rapidly changing SERPs the “classical” blue link rank is getting way more valid than the mixed one. Read: the only thing a publisher can affect with SEO tasks. Example: a keyword ranks on position 4 mixed rank is actually ranking on pos. 1. The reason for nr. 4 is "just": 1. shopping, 2. knowledge panel, 3. people also ask... Google's search features a publisher can´t change!