You do of course not hold old products by today's standard, that's just stupid. However, if a product of today can't translate "yesterday's standards" into something that is acceptable today and instead just cuts stuff, then you CAN compare the two, because because people will feel like much has lost on the way from back then to now.
I think there is some validity in your argument though, especially when it comes to stuff like videos/voiceover, etc. - the bar for this stuff to be of "acceptable" quality has just been raised by a LOT and if, for budget reasons, you don't have the ability to crate stuff that is at least "acceptable" (Would anyone really want to have badly done, immersion breaking voiceovers?), then it may very well be the right decision to not try to "bring over" the old stuff over to your new game.
The problem with that however is that you need to fill the void caused by cutting stuff by introducing new stuff and that is something that didn't really happen here (or, to the extend that it has happened, it has been "hidden" in the Civilopedia). They cut a lot. What is still there is extremely generic. And thus we have a very soulless version of the game.