Burden of proof should follow value of information, not plausibility. In particular, the most profitable thing to pursue is arguments you understand less about, which is often arguments in favor of things you disbelieve (since you’d be already familiar with arguments that’ve previously convinced you). So if someone wants to convince you of something you already believe, then the burden of proof is on them, but not if they want to convince you of something you disbelieve and didn’t get around to investigating yet.
Burden of proof should follow value of information, not plausibility. In particular, the most profitable thing to pursue is arguments you understand less about, which is often arguments in favor of things you disbelieve (since you’d be already familiar with arguments that’ve previously convinced you). So if someone wants to convince you of something you already believe, then the burden of proof is on them, but not if they want to convince you of something you disbelieve and didn’t get around to investigating yet.