I think there's also there matter of content and execution. I, like many others, enjoy watching classic films (many of them b&w), all the while accepting the differences in overall style from how films are done today. The main component for me is subject matter and general calibre of execution--how well has it stood up and still manages to speak to later generations.
For older viewers as well as perceptive younger ones value and enjoyment can be found in a great deal of older work. It also gives one another perspective when assessing newer works.
There are many younger viewers who are quite surprised to find they enjoy older works once they experience them. They're often surprised to discover that something "good" actually existed before their own contemporary frame of experience. They can learn to appreciate the roots of the materiel they enjoy today.
The original '33 King Kong has very primitive f/x, but they work in context of the original production. By today's standards they're laughable, but a perceptive and appreciative viewer can still accept it for what it's meant to represent--all the while not laughing at its primitiveness. And no one would dare suggest replacing or "enhancing" the original f/x because the entire work is a testament to the enormous creativity which brought the film to fruition. The overall value of the '33 King Kong is not diminished one bit by its primitive f/x.
In like manner TOS' f/x are outdated by today's standards, but they still fit perfectly in context with everything else in the series such that they don't need to be "enhanced" for the the series to be appreciated. The enhancement is an interesting conceptual exercise, but overall I think it does a disservice to the creativity of the original producers.