Do you know of any cases where a high quality explainer video (in terms of great animation and a great script) had a higher customer conversion rate than an explainer video with poor animation and script?
Is better better than worse? Of course.
Think of every TV ad you've ever seen. Would the advertising industry have spent so much money for decades on glossy message delivery if shoddy workmanship were equally good?
Undoubtedly they've performed numerous studies that justify their expenditures. Do you need to cite those studies? Common sense ought to suffice.