What is "it"? Knowing I read an email they sent me? That's not what criminals and businesses are doing; criminals and businesses build extensive personalised profiles of who you are, what you like, what times you're active, where you go, who your friends, family and coworkers are and what your personal trigger points are all for the goal of exploiting you. They use email tracking as a single metric among dozens of others, and the way they evaluate the metric is completely different to how an individual would evaluate it. That data is usually then sold to other groups that do the same thing.
How is that anywhere even close to an individual with email read receipts?
I don't think anyone would say "this is actually a real problem" besides people manufacturing a problem out of nothing. I'm also willing to bet that 99.9% of the people that are outraged are totally willing to establish, work for, or implement an extensive user tracking system for a company that actually acts on malicious grounds (such as monitoring users or for the objectives of making sales).
This includes you - by the way - a quick look through your resume shows that every single company you've worked for heavily participates in tracking and the first personal website of yours I accessed at reset-hard.com includes Google tracking which is dozens of times worse than a "weird coworker" knowing you read an email they sent. This is literally contributing to a global database of user tracking which we know is used for malicious purposes.
> I understand that sometimes the specific triggers that make people care are stupid, but my response to that is never to ask people to care less. It's already hard enough to make people care about things.
When people care about the wrong things is when we end up with homosexuality being criminalized, prohibition or terrorist groups. So hopefully in this case - just like many others - people would focus their energy into things that actually matter. And personal email tracking is not one of them - and will never be.