Site audit

What are the most important checks for you in a website audit? Work on https://issuedetector.com/ Currently detecting 15 issues: 1. Broken links 2. Redirects links 3. Slow pages 4. Non https links 5. Empty titles 6. Dupe titles 7. Short/Long titles 8. Empty h1 9. Dupe h1 10. Short/Long h1 11. Not enough internal back links 12. Too many external links 13. Too many links 14. No unique images 15. With & No trailing slash What checks are still missing? Thanks