I use Feedly premium and treat my newsletters the same as any other form of written content (including HN, Product Hunt)

Each day I go through 300 articles using shortcuts :

n -> go to the next p -> go to the previous m -> mark as read x -> discard o -> open

I do my daily curation this way. I would say I read roughly 5% of the articles/content.

But it's pretty quick and I am aware of new major versions of programming languages/frameworks I use.

New products, interesting newsletter content, etc.