said, it might be impossible to see that some of the hardware is completely uprooted and replaced by modern equipment of roughly the same shape and size. But conversely, we have seen some elements of the Miranda
and the Excelsior
undergo a prominent visual change even though the models weren't retouched: the warp engines now glow an intense blue, unlike in their original 23rd century appearances. Perhaps some major refitting has taken place, but it does not manifest on the outside?
The strip phasers might also be considered a fad whose time came and went, and really
modern phasers are very small and are being predominantly installed on ships the most severely lagging behind in firepower, and (not so coincidentally) incapable of receiving other sorts.