I never saw a warning for malware and phishing in the browser. I do receive phishing emails obviously, but they are easy to spot. I read mail with Thunderbird and sometimes I check the source just to see which strange URLs they're using this time :-) If you read mail in the browser maybe disabling those checks is not wise. Agreed.

Disabling HTML5 video DRM could be annoying and geolocation is solved by the popup, as you say.