No we don't. It's a choice.
Make a comparison with scuba regs. I have a bunch of Apeks DS4 first stages (and a couple of DSTs).
Next to the DS4, there's also a Tek3, DS1, US1, US4, FSR, MTX just to name a few.
Do we really need all these models when a DS4 still does a perfect job? Surely nobody is complaining about Apeks.
ScubaPro does an even better marketing job, as dealers have to sell a minimum amount of equipment to keep their dealership, which is one of the reasons why ScubaPro regs are on display and other brands get a less prominent place.
An even wider choice of equipment is available when it comes to BCDs. And although numerous jokes can be made about BCDs, especially by BP/W divers, BCDs are still being sold in a massive variety and price classes. "Customer wants to spend $1000 on a BCD? We'll sell a $1000 BCD!"
Still you, as a customer, are the one who decides which equipment you choose. And nobody says that the wide choice of models is absurd.
I don't believe that analogy works. Regulators, BCDs, etc. are basic equipment that can be used by any diver. A large diversity in choices serves the industry well. It allows divers to pick equipment that best suits their needs from a cost and feature perspective. In contrast a Mermaid Training Program is a completely different thing. It is attempting to create (or serve) an entirely different market. THAT is what I find a bit absurd. Is this market seriously large enough to warrant an entire training program? I honestly can't believe that it is. Perhaps they believe they can create the market. Time will tell.