I suspect part of the reason they didn’t update the FX shots in the TNG-R is simply because it was already an expensive undertaking and unlike TOS, the ships held up resolution-wise. They would have redone TOS either. Again, with new FX ever becoming more less expensive, I think it’s just a matter of time. Heck, even keeping every last ship in every last (reused) shot, I’d still want shield bubbles, battle damage, more shots fired…each ship maneuvering more realistically, still further apart, and plain old higher resolution on each ship…there’s a tactile verisimilitude to the look of Discovery that you don’t get in some old Hideki or what have you, never mind looking into the windows. Plus, they can all be lit better, both more realistically and prettier — Every. Last. Ship. But it would be a labor of love. And fantasy. Which is what this is all about.