The road to Google's Hades is paved with good intentions
The Googleplex may uk consumer email list have thought this was actually a good idea, but if you asked email marketers about this situation they would unanimously say that this is just another example of the road to Hades being paved with good intentions. Sure, it does make a bit of sense to keep emails short and to the point, but the fact that Google has taken attribution upon itself without taking into account the permission of affiliated brands by leaving 20KB in its email and hiding the next part from customers using iOS devices unless they take the step to choose to see everything (and many don’t) is questionable to say the least.
Google has almost all the characters for its 20 KB limit

The 20KB limit is even tougher than you might think – Gmail considers every character in the email to be included in the count, so all spaces, as well as inline styles and every tag like <p>, <br>, <div>, etc. add up to the 20KB. Also note that any image URL will have about 170 characters added to it as it redirects to Google’s proxy servers. If there’s any positive news to this forced truncation it’s that images oddly don’t count towards the limit. If you play your cards right, you’ll be able to fit around 200KB of images in before the Google gods determine you’ve exceeded your ration and start cutting off your emails.