I am confused about CMS and SEO. I am developing a website with JSF. The website has a blog and other contents. My customer wanted from me to use WordPress as a CMS. he said that it is good for SEO. But I wrote an admin panel for him. blog entries can be added, deleted, changed or reversed by multiple users. Also I am checking web pages with Google Analytics and seo checkers like seositecheckup, semrush and fix my errors. I changed URL of blog entries to be SEO friendly. So do I need CMS really for SEO ? What will the CMS do more ?
I do not think my question is duplication. because I did not ask why CMS can be bad for SEO. I am asking do I need CMS after what I have done and if yes what will CMS do more ?