I'm not quite sure if I got this right, so I figured I'll add an issue first and get your opinion but the parameter fos_http_cache.compiler_pass.tag_annotations in https://github.com/FriendsOfSymfony/FOSHttpCacheBundle/blob/master/src/DependencyInjection/Compiler/TagListenerPass.php#L28 is set to true as soon as you enable cache tagging (https://github.com/FriendsOfSymfony/FOSHttpCacheBundle/blob/master/src/DependencyInjection/FOSHttpCacheExtension.php#L108-L119).

Why is this?

I mean, what's wrong in having all the cache tagging logic/services (cache_tagging.xml) without support for annotations? I only add my tags using code.