Because Atlassian manages to extract boatloads of enterprise money for a product portfolio that can be best described as an inconsistent, unintegrated mess.
Everything they have was bought together and crudely integrated, with each product having totally different ways of using and administrating them. Not to mention that core features (e.g. "merging" duplicate user accounts, SAML login) are paid-for plugins of varying quality. Feature suggestions for the products end up in multi-year-old tickets that one has no way to influence.
But still, enterprises are buying up that crap because the alternatives to JIRA and Confluence plainly suck even more. The only thing that has real competition is Bitbucket, with Gitlab and Github as more than viable alternatives.
One such 'feature request' is 'unsubscribe from email': https://community.atlassian.com/t5/Jira-questions/How-can-us...
Mental.
I have a rule to send it all to spam.