Re: IIRC the major problem with Betamax
"You remember incorrectly."
Well, a little Googling tells me that PAL recordings were likely long enough for most films on introduction but NTSC, the standard used in the prime markets of Japan and the USA, indicates that at normal speed the tapes were only long enough for 60 minutes. I don't recall, nor have searched deeply enough, to find out if Betamax recorders had the ability to run at 1/2 or 1/3rd speed at introduction or, if a later feature, how much later that was introduced.