It won't tell you anything the papers don't say.

Research synthesis that refuses to guess.

Won't grade on opinion. Every score is arithmetic you can redo by hand.
Won't claim a contradiction it can't quote.
Won't pretend it read the full paper. Abstract only? Capped at Moderate.
Won't hide a bad run. A database went down — it says so, at the top.

Method published. A study pitting us against six rivals is registered before any result exists — and if we lose, that's the finding.