I do agree if it were not a single button the likelihood would be much further less. I would imagine ideally one tap to open a modal window and then one tap between 'This is spam', 'This is harassment' or type in Other : []. So maybe just moving the Create Report to where downvote button now is worth trying.
There is a fundamental difference between YouTube and Lemmy though - community members and community moderators. I think having a signal from dislike is much less needed because of it. However, I do think it would be nice (not impactful at the current size of community) to have a viewcount of some sort.
Reports should not downrank posts. It should notify moderators. Moderators can decide to add a mod comment, hide the comment, delete the comment, message the commenter etc. There can be tools under moderators control to automate this.