If you really think GiveWell or Open Philanthropy is missing out on a lot of value by failing to pursue a certain strategy, it seems like you should aim to make the most convincing case you can for their sake!
(Perhaps it would be safer to write a post specifically about this topic, then send it to them; that way, even if there’s no reply, you at least have the post and can get feedback from other people.)
If you really think GiveWell or Open Philanthropy is missing out on a lot of value by failing to pursue a certain strategy, it seems like you should aim to make the most convincing case you can for their sake!
(Perhaps it would be safer to write a post specifically about this topic, then send it to them; that way, even if there’s no reply, you at least have the post and can get feedback from other people.)