Perhaps those who elect to do “speed dating” are in fact to busy for a relationship in the first place.
They probably figure the option will always be there in the future, so there’s no urgency to date just for the sake of it.
It should more properly be called ‘speed introductions’ rather than ‘speed dating.’
I tried it when I was single. When it was ‘7 minute dating’ it was ok. When it was turned into ‘8 minute dating’ it was just too much commitment.