It happened to me last week. I was so pissed. Completely unbelievable. Zero notifications to my other email accounts. Hope Yahoo finally goes bankrupt.
I am not a developer, so take this with a huge grain of salt, but this comment sounds a bit like old school photographers saying iPhone and Instagram are not for “real photographers.”
What are the legal implications of doing this based on jurisdiction? There are also ethical considerations. I expect this to be another thing which will be an 'open secret' in the tech/marketing worlds until other people find out about it and will be upset about.
I use email all the time and have never even remotely encountered a point where I would need something like this. Why wouldn't you simply refer to a subject line? And why would someone say "Did you see email E2YKW3" I can't imagine a single person saying that frankly.
I tried the most recent MacBook Pro keyboard over a weekend in September. Absolutely terrible experience, not to mention the Touch Bar. I hope my 2015 MBPro doesn't die on my before Apple fixes this.