I like the approach DSC is taking and I agree that it has to pass to 2018 muster, but...
I have to agree with this as well. I've been hearing the "cardboard" bullshit for over 20 years. Basically practically since Day One that I joined the Internet. To unintentionally work a Throwback Thursday into this post, I cringed when Stewey even called the TOS sets cardboard back in the ENT Days. Way to stick up for the series you're holding sacred! So, after all this time, I've developed a thick skin to that criticism.
The real problem is: there are probably lots of people out there who believe it. But nope. Star Trek sets have always been wood. And they used to be lit with color. Many of my favorite Trek sets ever are from TOS. I'd put the Talos IV sets up against anything made during my lifetime.
Calling them “cardboard sets” is just shorthand for how cheap looking they are, not that they were literally made out of cardboard. It gives a certain cannotation that a more literal term like “plywood sets” would not convey. And let’s be honest, for 2018 television standards, TOS is very cheap looking. That doesn’t mean you can’t enjoy it now. I think anyone watching it can suspend their disbelief knowing that it was made in a very different era of television.