I remember a few years ago, when the RFL made a particular rule change, (can’t remember which of the many it was, probably stopping pushing and striking for the ball in scrums), everyone assumed big busting props would be obsolete, and the likes of Denis Betts would run riot, because they were fitter and faster.
TBH I still can’t see why that didn’t happen, get fast mobile props and run the legs off the over weight bar stewards I say.