My question is pretty straightforward.
If I would only do searches on pages (no typed searches on blocks for instance), that is content that I can navigate to, and have set the convention to add all content area blocks as searchable content in the searchtext$$string property; do I need to index blocks or can I disable indexing them?
You won't need to index them.
But not indexing them also means they won't show up in the internal search provider in the CMS when using the find search provider.
Good point about searching inside Episerver, didn't consider that part, thanks!