Open baffle is much easier/cheaper to design/build. Even incompetent dudes with an open baffle offering can claim they are good at designing speakers. On the same note, If someone’s getting greedy/ trying to overcharge you for it (could name a few), have a second thought about it.
Tell that to Linkwitz. Just as many, if not more, incompetent dudes design box speakers
I am a business owner, just an audio enthusiast (not in the audio business).
But, give me 3 hours and I'll build you a open baffle speaker in my garage and the sound of it will get you jawdropped. I already know which pro drivers to use and how to build your crossover. I'll charge 20k just for kicks and laugh all the way to China town.
Can I design/build you a ns5000, tad, etc. Absolutely not (do not know the secrets/have anywhere close to the knowledge base of the gifted dudes who design/build such things)