SEO PowerSuite does not really "use keyword packing as part of the analysis", that would be a misleading statement. What happens in terms of onpage optimization, is that WebSite Auditor analyses the
working strategies of your competition and suggests you do the same. Sites that do "keyword packing" do not rank high nowadays, so WebSite Auditor does not suggest to stuff your page with keywords. If keyword packing worked and the top 10 competitors' sites would be stuffed with keywords, then it would mean doing so really works no matter what experts say. But again, it does not currently.

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Google does not rank pages by keywords (keyword packing)but by a single keyword and content of each page

How exactly can a robot evaluate whether the content is relevant to some niche/keywords set if the text on a site does not contain keywords? You seem to be contradicting yourself. When people say "pay attention to content" it means that your site should have regular additions of text
containing your niche keywords in order to rank high for those keywords. This is what onpage SEO is and will always be in larger or lesser degree, and WebSite Auditor helps you understand that degree in each unique case.
As for other ranking factors like link popularity and social media popularity — our software focuses on these factors as well, see SEO SpyGlass and LinkAssistant tools. However it's the combination of ranking factors that matters, not just one of them even if it's declared most important and trend-setting. Google would risk their credibility by switching to the +1 metric immediately, as it's easy to manipulate (you can buy thousands of +1's for $20 now already, so not too objective).