Email clients explicitly added this feature to protect user privacy. If you have compelling email content, you can ask your recipients to whitelist your sender, or alternatively to open a mirror page ('click here to view images').
As far as business objectives, open rate's primary utility is in testing subject lines, in which your non-tracking population can be treated as a constant anyway.
the open rates just seem to increase, because the open pixel gets loaded, but your click-to-open rate decreases dramatically -> The content and subject lines get jugded wrong, because it seems that so many people are openig your mail, but don't click it . I always recommend to test new subject line concepts on recepients who never opened an email. Your subject line is really good and should be used for your active segments, if it convinces the inactive recepients to interact with your content. The same logic applies to CTAs.