Should Speaker Manufactures provide a Frequency Response Graph?

The amplitude response of a speaker is a moving target. It will change depending on the room. There are also other factors that play a significant role in audio fidelity like phase behavior and group delays. I do not pay attention to specs. I review the design of the speaker and make the best determination I can that I will be able to make the speaker perform to my expectations. 

I might also add that measuring your system in place is much more informative. 

So, the most important marketing tool should be measuring frequency response in an anechoic chamber..  This means, once they are done designing a speaker to meet your measurement requirements, they are done with their design work.  What could go wrong?

I think they have a lot more to publish before the frequency response graph. Honestly it's a mess what they don't publish. Power handling, sensitivity, impedance, crossover frequency, prices, where to buy, decent photos, company info, contact there is so much that's missing