When Apple prevents email senders from using invisible pixels to track email opens (and other things), it hurts those who rely a little too much on email opens as an engagement metric, and spammers.
The amount of time they spend on your website, the number of sales you make when they click the link in the email, the revenue you generated and the seriousness with which they take your advice/recommendation shown through other means are still available and in my opinion better outcomes.
Vanity metrics, should serve a purpose, to rectify an intermediary step before the end goal - either revenue or time on site. Showing email open rates might have helped you write your next email differently but then clicks to your website is a better metric.
There is always a better way of doing things, which help your job in the longer run. Relying on technology for part of your job is good, it shouldn't triumph over privacy as your customers see fit. Or over the creative aspects of your job as a marketer.