[Seirdy]

Plain text or unformatted email, in my experience, is more likely to have come from an actual person who genuinely wants to send me something. Heavily formatted emails optimized for user manipulation ("engagement") are typically sent by marketing departments who want to sell me something and can be safely discarded and added to my killfile.

I typically recommend all my friends to do the same, and many of them already do. How do you think most people react when they see a banner saying "Would you like to load remote images? [yes] [no]"?