I’ve found I really enjoy the convenience of Safari Toolbar extensions for Raindrop.io & the GoodLinks app. The trifecta would be to have a Drafts extension as well.
Take a look at bookmarklets in relation to the Web Capture extension. If you are looking to capture to Drafts from the browser, then this might well suit your needs.
And why would an extension be better than using the share sheet?
(I’m not averse to it; Just wondering.)
Not necessarily better, just a bit more convenient and streamlined when using the toolbar extensions in workflows