How is it more "feature complete" than any other 40-series card? How is being "feature complete" important when talking about value?
As for being the fastest, it is true, but at what cost? It's not just ultra expensive, ultra power hungry, but as soon as the 5090 is out, it'll drop its value like a rock. It is only for people who's got lots of spare cash to blow and don't care about value at all. For "normal folks" like me (that is, casual, or home gamers), a 4080 Super or 7900 XTX is a much better buy.
I don't think a card needs to be within any percent to the GRE. I think it needs to be as close to the top as possible, as long as it meets the performance level one needs. For example, a 6600 is a great buy, good value card, but only if its performance is enough for the targeted resolution, detail level and frame rate.