Importance of rankings?
After the launch of Google's new ad layout on SERPs, which shows 4 ads from last few months for almost every query made by user, But still rankings for these keywords important, because paying money for every single keyword is not affordable for every business or individual, so I prefer here get rankings for those top keywords which are very important for your business, this you achieve by gaining top quality links by using informational content which users like to share more and more.
Remember; keep producing content which Google pickup from Featured snippets in search.
Favourite Ranking Strategies?
I am a very big fan of data-driven content & facts with numbers, which people also like to read & share. This means first create very good content with some visuals for sure in content along with some tips & numbers etc. because people come again and again to your site to read this content and will share it more and more in their social channels & groups.
Second, I will suggest you focus on competitors who are already ranking on Google for those keywords and try to analyze their backlinks for those ranked pages and their SERP view as well.
Elements to be covered in SEO site audit?
Robots.txt file & along with Robots tag is very important for me the first thing is to see on every site because misuse of this can damage site rankings in SERP.
Then, I will prefer to go for Page Speed because the user experience is very important & without a good page speed it can't be achieved.
Rel=canonical Tags are very important for me to check, these tags will set the platform of rankings for a website in SERP for the dedicated page with unique content.
At the end, I recommend using screaming frog tool to analysis your website from A-Z.
Your Dream Feature not present in current SEO tools?
One thing, I am currently searching or you can say trying to see in any tool is "voice-based searches" made by users on a mobile platform like android, iOS & windows. Rest features you can find in any tool but not everything in one tool & it can't be possible because every few months something new will come to audit as Google has more than 200 rankings factors to consider for rankings.