Not all apps with Symfony are some CRUD backend that will be only used for logged in users. And sometimes, WordPress is just an overkill for a couple of pages that will be used for a marketing website. In those cases, you still want to keep using Symfony and you definitely want to optimize for your search engine. Also, wordpress and most existing cms are just a pain for users and developers, if you find more disadvantages for using them (for your use case), just don’t. Everyone will love you.
In my opinion, you don’t even need a bundle here. I think it’s fine to roll out your own code instead of adding one more dependency by installing a new bundle. Why?
In case you wanted to add google analytics tracking code, the easiest way would be to create a template for google analytics tracking code and include that template in your base layout.
If you want to modify some basic SEO meta tags, here is a sample code snippet that I have used in one of my projects that’s easy to extend and modify.
Here is an example on how to use it
In case you wanted a sitemap, here is an article that helps you get a sitemap up and running.
Hopefully I have demonstrated that having some basic SEO with Symfony isn’t complicated. If you have any better ideas or you do things differently, please share them in the comments below.