I only was just able to start watching Discovery, and I like it so far...but like many others, I am disappointed by the fact that the Discovery era ship designs - both Federation and Klingon - seem to bear very little connection the the ship styles that come before it and after it.
The Klingon ships are very creative...but they seems more like something out of Dune, than out of the Klingons as we have known them in Star Trek.
It's like there was this period in Klingon design were they went off on a tangent and then reeled it back in later. I think if they explained it at these being really ancient "classical Klingon" ships or maybe special ships used by the leaders of the greatest and oldest Klingon houses, maybe I could wrap my mind around it.
I was really hoping to see John Eaves unused D-4 design show up in Discovery...
And the Federation ships, yeah, don't seem to have a cohesive design aesthetic. And they do seem a little "advanced" for the 23rd century.
I think you can still maybe realistic and futuristic looking ships that look like an updated version of the 1960's TOS aesthetic. The ship designs for Axanar did. And they combined elements form both TOS and the Kelvinverse designs.
Sure, the Discovery ships don't have to look *exactly* like this...or even exactly like TOS ships. I don't mind designs updated a bit...but, other than the Discovery era Enterprise, nothing looks even remotely like anything that came before it or will come or after it.