I've never been quite sure what the supposed advantage of a 'spring assisted' knife is supposed to be. IMO most every type of folder worth having has a 'opening hole' or notch that allows it to be opened single handed about as fast as anyone could want.
For me, regular folders are faster to open that those assisted ones.
I agree that with the knives available today, spring assisted opening isn't all that beneficial but it hasn't been all that many years since opening a
typical pocket knife was a two handed operation.