Interesting article.
I like the Mosin Nagant a lot for what it is. A simple, robust, and reliable bolt action rifle. I do not think that it is particularly crude or simple to manufacture. It was state of the art when introduced, and it does have all machined steel parts. I'm positive it is a far tougher action than 90% of the modern rifles sold.
It's inexpensive now because so many were made, and it's obsolete compared to a modern sporter rifle. Its a fairly obscure caliber and not amiable to optics, as a modern rifle should have.
But the design is sound, and with all the machined parts, I'm sure it would cost as much as Winchester Model 70 today to produce. Probably more.
It was ahead of its time in that it had a floating bolt head, and a centerfeed magazine (like many modern actions). The Mosin is fine for what it is, and has a strong reputation for reliability in adverse conditions. I bet if Ivan chambered it in our 30 caliber, a true 308 bore, it would have a bit more acceptance in the US. A Mosin is a solid rifle, only handicapped today by lack of optics and a thin and simple factory barrel. If you needed to survive in Siberia, a Mosin would be fine. An M1917 would be a bit better. And if Bubba got to the M1917 and milled the receiver for a scope, collectors would cringe, but you would have a great rugged rifle.
But I will always like my Mosin rifle.