Technical SEO is a broad topic
The fact that you have a noindex in your main selling page because you forgot to uncheck the anti robots checkbox in WordPress when you released your page to production is Technical SEO. It's going to hinder your page ranking for sure.
But also having all your canonicals in place is technical SEO, and it's totally unclear the real impact of this. Theoretically you enter inside the domain of things like "crawl budget" which some operators support and others don't.
Same for Core Web Vitals. Technical SEO at the core. But there are sites ranking perfectly with feeble CWV and others on page 98 with a perfect 100 CWV and every single detail of Technical SEO known in place.
So take Technical SEO with a pinch of salt. A tool that can help you find discoverability troubles can be useful, but forcing yourself to do a million gimmicks to feel that your site is perfect is almost useless. The big question is: what actually moves the needle in 2026 for most operators? That is another thing, and perfect Technical SEO isn't.