The technical part of SEO does not really belong to the SEO category. Still, the technical setup of your website has an impact on your SEO, which is why it is called technical SEO. How crawlers and bots read your website depends on the technical setup. There are so many ways to make websites. Still, there is a standard. However, this is rarely followed 100%. In addition, the standard changes over time, so it is not a success criterion to be 100% correct. But continuously stay “As accurate as possible”. This is also the reason why many change website often. It is easier to start over with the new technology and standard, than it is to maintain and update the old one.
Therefore .. If the technical part of the website is made correctly, the technical part of SEO does not fill anything in the ongoing SEO Work. By changing website (Design on your wordpress) once a year or every 2 years, you ensure regular updating of standards, provided the new theme complies with the standards.