I’m not the expert here when it comes to this!
Well this is an interesting topic. I had a conversation once with another audiophile who said a box store salesperson told them that "X" brand of speaker were no good because they use "off the shelf" drivers. Hmm I thought, that’s interesting because most speaker manufacturers do. The magic comes in how those drivers are implemented, the design of the cabinet itself ie. bracing, time alignment etc., the cabinet materials used, crossover design and voicing of the speaker. Not everyone can afford to design & build their own drivers.
Salk Sound & Daedalus are examples of small manufacturers who build wonderful speakers but use "off the shelf" drivers. If you want a truly hand built design from cone material up, look at Voxativ. Then compare the prices! Still other manufacturers have driver companies build drivers to their specs. Which is better? I guess you have to let your ears decide.