However I routinely deny notification requests in Firefox so this is not a problem. I also routinely deny the permission to use canvas image data. Firefox warns it can be used to fingerprint browsers https://support.mozilla.org/en-US/kb/firefox-protection-agai...
Sadly Apple does its best to make more money. If they allow other browser engines they'd end up selling less apps. IMHO they'll care about privacy only until it positively correlates with making money. If it will ever cost them more than it gains, they'll find a way to weaken privacy without losing face.
An example, Apple ruthlessly enforcing in app payments for small companies but bowing to Netflix, Amazon and the like. They know they would sell less phones if those apps won't run on iOS.
And that's expected. Why would a company care about you and me in this age? No more than what you and me would care about ants.
Removing this feature from all users though is not a good solution either. Chrome allows you to block notifications from all sites so you don't have to dismiss requests anymore which seems like it would suit your needs and at the same time allow others to use this feature.