I think it's largely a matter of perspective. I don't think it's fair to say that the premise followed by later producers in order to flesh out the series, namely deciding that the TOS Enterprise is specifically a Constitution class cruiser, was done because of disrespect or inadequate research. No more than the fact that the Klingon culture in TNG was shown to have a concept of honor (which they didn't always follow, just like humans
) is inherently at odds (or has to be at odds) with the entry given when TMoST was published. That's why the Defiant plaque was changed when "In A Mirror Darkly" was made, because the franchise had evolved since then and it didn't make sense to use "Starship class" in the vein that might have been contemplated in the 1960s. That's my two cents anyway.