Google has no interest in end-to-end encryption: It would put them out of the loop. It would be contrary to their mission to analyze the customer data to deliver better ads.

Gmail is a big privacy problem. Even if you don't use it yourself, nowadays a large percentage of your emails will end up there. And why? It's all about lazyness and low friction.

Computer literate persons (that's you, right?) should really consider to get off their butts and host their own email. It's not hard, it's not expensive and it's not a lot of work to maintain either. It can even be fun and informative. By sticking to gmail, you're no longer credible when complaining about the erosion of privacy on the internet.