I don't disagree in much of the general look.
The problem is this isn't really between that, this is a decade before TOS. While the Connie may have already been in service the Connie class vessels are considered heavy cruisers still at this time and considered to be the top of the line ships in the Federation. It seems only reasonable many of the aspects of the Connie would have been reworked into period ships.
The problem is even the Klingon ships do not fit the time period, so it can either be assumed they're in an alternate reality that will merge with or link to the prime timeline, or all the visuals have been changed to conform to a modern audience, in which case that is a really silly thing to do.
I can totally see ships from the late 2100s still being used by the 2250s, but every
ship we have seen so far has these updated visuals and I can't rationalize that as anything but the effects team not respecting the established canon until proven otherwise.
Would have much preferred to see ships with updated visuals sticking to a style like
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the nacelles look like a half way point betweent he round ones and the rectangle ones in TMP
This doesn't fit. The Shenzhou is a Walker class vessel, noted as being already out of date by the time of Discovery. We also have it confirmed that the classic Constitution class at this point in time is considered to be one of the best and most successful ship designs in the Federation. If those rectangular shaped nacelles were a true halfway point, it is reasonable to assume that between Pike and Kirk the Enterprise would have been updated to use the better equipment, but this is not what we see in TOS.
Screen grab from the episode that will be out later tonight