I don’t understand Fenders current strategy. The Squire CV basses I have played are frequently better than the MIM Performer’s. The Vintera, Nate Mendel and Flea MIM basses are excellent, IMO easily as good if not better than many of the USA built Fenders.
Fender seem to have lost the plot in terms of price and marketing, which I feel is impacting the used market as MIM basses are still seen as being inferior to the USA models when many lines, the Vintera for example are premium basses. I sold my USA P before the Vintera. They were both good basses but the USA one was just a bit meh, bland with little character whereas the Vintera was a joy, bags of character and sounded fantastic.
Edit: I don’t think the old hierarchy of Squire / MIM / MIJ / USA makes any sense anymore. Just buy the one that works for you at the best price. To answer the original question would I buy a 40th Aniversary Squire. No. There are 2 used Vinteras for sale on this forum at bargain prices. I would snap them up.