Top and bottom wrestling is folk style. Just call stalling appropriately during the match, including SV, and most matches will never get to TB.
I doubt they will ever switch to true freestyle, because many facilities don't support continuation of action thru out of bounds.
If freestyle is out, no need to bastardize the folk style rules to diminish the role of riding, including in TB of OT.
Afterall, it was tied after 9 minutes of wrestling with likely well over 5 minutes of neutral (wrestling action or uncalled stalling). So there seems no point to more of the neutral position.
A boring match is going to be a boring match, no matter how a winner is determined in OT. Selfishly, I just want the boring match to be over already. TB rideouts seem good enough for that.
I doubt that a meaningful criteria could exist for a zero takedown match that is tied at the end of regulation, so what'd be the point of it?