What?
The Enterprise often looked a bit greenish on the show. That's why the TNG Enterprise model is painted light green. They wanted to get the same look, but it turned out gray on screen.
See here for an example: https://scifanatic-wpengine.netdna-ssl.com/wp-content/uploads/2018/02/tos-pilot-nacelle-caps.jpg
Change the nacelle design and I'd agree with you.
Why? Warp nacelles have always had various shapes. Rectangular or round or whatever. So long as they share design elements, components and plating, that looks fine to me. And again this is where the TOS Enterprise sticks out.
The USS Kelvin and the USS Shenzhou have literally nothing in common with each other
Now you're just being contrarian. They have plenty in common, down to the plating and general designs.
Indeed. What some posters here (and the designers for the show) don't quite seem to grasp is how much more that asks of fans.
I think you're confusing "fans" with "purist fans". I'm a colossal Star Trek fan and I'm fine with the new ships. Because although I do care about continuity, I'm not a purist.
That's an impossible test to execute, obviously.
Impossible? You put pictures together on a JPG and show it to people, and ask them the question. How is that impossible?
Well, this is certainly about what I like...
I'm not interested in what you like and I suspect you are not interested in what I like. That's why I'm discussing something else; namely what constitutes design continuity in Star Trek. Subjective, yes, but it's not just down to personal likes and dislikes, where you can't actually make arguments.
Bottom line, you're saying that one way or another, audiences are being asked to mentally edit something they've seen.
What are you talking about? No one's asked to edit anything. It's not as if your TOS DVDs are going to be altered or that you have to imagine it to be different when you're watching the show. Everything stays the same, but Trek from now on assumes that the ship looked this way from the get-go. Hell, the Klingons have changed in 1979, 1984, 1987, 1991, 2013 and 2017. That's a lot of retcon, and you can pick your favourite, but you don't have to imagine that Kor looks in TOS like he looks in DS9.