I'd be interested in stats for RFEs and interviews for I-751 cases.
Denial rate might as well be microscopic, agreed, but factor in RFEs and interviews. My preference is to avoid those altogether. The process is already long enough as is, even for a straightforward case.
Multiple consults with lawyers, experience gathering evidence as requested by lawyer who filed my case, free sources like Jim Jacking's show and VJ posts suggest that submitting substantial good quality evidence is the key for painless approval.
I know somebody who did I-751 in early 2010s and his case got approved with so little evidence by today's standards, it's laughable. He would have gotten RFE and / or stokes with amount of evidence provided, should he filed in 2023. His packet only consisted of completed form, maybe 3 bank statements and 5-6 photographs. That's all. Approved in about 3 months. It's obvious the times have changed and the standards got higher.