I recently had a discussion with someone who complained about the Gmail permission dialogue when adding his Gmail account to the Windows 10 mail program. He was

I recently had a discussion with someone who complained about the Gmail permission dialogue when adding his Gmail account to the Windows 10 mail program. He was absolutely convinced that he will not agree to giving Windows permission to view and send emails for him and instead requested that Google and Windows enter a contract that only allows him to do that. It was completely impossible to explain to him the technical background (e.g. that him sending an email through the program and the program sending an email by itself is technically the same thing for Gmail) and he wouldn't accept that Google is quite rightly informing him about the implications (Google should change the text to say it only allows him to send emails). As you said he expected Google to give him technically impossible guarantees and handle that the third party software can't do anything without him confirming it.