As any UI designer knows, if everything is important nothing is important, and so I just treat those as the spam they are. Which lead to a legitimately important mail getting lost, but it only caused problems for them so ironically they shot themselves in the foot with their dark patterns.
As someone who subscribes to lots of newsletters, the "interact or we will auto-unsubscribe you" thing still annoys me.
IF you get spamfoldered by enough people the provider will just start sending to the spam folder for everyone. Your newsletter is now useless
Anyway, it's been like this for years and the overwhelming majority of email clients load images by default so everyone mostly works around it. I don't think it's changing any time soon.
edit: apparently they automatically cache the images on delivery, which should work. This is really a change that needs to come from the mail providers so good on them. As long as they don't try and assume what the user is interested in like Gmail does, they can drop tracking all they want.
Additionally, if I'm receiving a message from example.com, and links in the message are not targeted at example.com, but some bullshit like sendgrid with a query string that won't fit across a 4K monitor, I'm deleting it.
The other day I received an email from ft.dk, the danish Folketing. Our parliament. I mean legit dot gov stuff. It had email tracking through Sendgrid. I sent them a strongly worded email and asked them to cut American tracking companies out of our democratic process. And then I deleted the email.
All this tracking seems to have just become the new normal, and hardly anyone cares about it.
Of the major email clients, I believe Thunderbird is the only one that does so by default.
Odd thing was, I wasn't on any of their mailing lists.
Which would explain why they didn't register a tracking pixel for a long time.