So original Star Trek fans get to throw poo at Discovery and its crew for months but as soon as someone from Discovery calls the TOS sets cardboard it's "OMG, disrespecting a fictional tv series, how dare they?!" time. That's a bit hypocritical, isn't it?
And I don't agree with the argument that they should respect TOS because without it they wouldn't have a job today, while technically true at some point people can and should stop caring about that. I certainly don't respect the architect's work who designed the ugly ass hospital I work at in the late 60s. "But you wouldn't have your workplace without him!". So what, that doesn't make it look good, it's godawful ugly and no one in their right mind would build a hospital like that today (there are in fact plans to build a new one and demolish the original).
Roddenberry himself had them redesign the shit out of everything for TMP with a flimsy on screen explanation of "eighteen month refit" and that wasn't done with any care for the original look or an attempt to resemble TOS, one look at the Phase 2 screen tests shows that they were planning to do something much closer to TOS until they got a feature film budget and apparently declared "Woohoo, we have money to spend, goodbye sixties aesthetics!"