I have very often re-read my library of classic science fiction novel (Clarke, Heinlein, Asimov, Bova, etc). A book I might re-read in 2017 will elicit different images in my mind of the technology being described compared to the images those exact same words might have elicited when I first read that book in, say 1987 -- or the images the words would have elicited if I read that same book when it was published in the 1960 s or 1970s.
The written descriptions don't change (obviously the words are the same), but the ideas on my mind of what those words are describing changes.
More to the point...
...I suppose If I read a Star Trek novel in 2017 that took place during "The Cage" timeline, but took place aboard a totally different ship, I would most likely not imagine that ship having gooseneck viewers, nor would I imagine that their communicators have visible resistors in their circuitry, or that they were all wearing velour turtlenecks.. I would probably imagine more futuristic-looking technology (and art direction in general) than what I saw in "The Cage".
Maybe if I read this fictitious Cage-era book in the 1960s the written descriptions might elicit "The Cage" visuals in my head, but not if I read that same book and same written description in 2017.
I like the idea that they put forward in the finale of Babylon 5 - that the entire five years and associated tv-movies (and presumably the spin-offs) were a result of the series being an in-universe dramatisation of actual events and may not have accurately portrayed the real events creating some anachronisms and/or contradictions.
Perhaps ENT/TOS/TNG/DS9/VOY were a dramatisation of key events in Federation history made post-Nemesis, whilst DISCO is the actual version of these events - or another historical dramatisation but by a different production team in 2450.
Think of how The Tudors chops and changes Henry's family ties, eliminates characters then has to retroactively insert them when they become important later or conflate them with others. The White Princess and The White Queen have the same issue - even when they're intended to be in the same continuity (and share several cast members continuing in roles), at times they contadict each other and contradict history too.