Speed of opening isn't the only attribute of a knife. It's like saying only cars with top end speeds over 200 mph are worth owning. So, how do you get that load of firewood up from the back of the property? Knives do more than just open quickly.
A flipper is just another form of assisted or spring opening, same as a hole. It has nothing to do with blade shape, profile, grip shape, or versatility. You can put a lot of features that make it a wonderful tool, and then add a flipper - which screws up the design and makes it something less. They are out there - I've nearly bought some just to grind off the flipper and have a good using knife. Fortunately, there are better choices.
I'd rather have a knife with a good thin edge that cuts, from a better grade steel with abrasion resistance, than a gimmick that can only open the blade quickly. What good is it to have speed if the edge is thick, blade profile inefficient, and there's no utility to the design?
There are more important features.