I haven't waded through all the posts in the original thread, but I certainly raise an eyebrow at the notion that Tolkien was actively trying to promote an agrarian way of life (whatever that might be).
The Shire is completely out of place in the LOTR milieu. Whereas the rest of Middle-Earth serves up a medieval setting of clanking armour and spears, the Shire is a little enclave of Edwardian England - a sort of diminuitive Downton Abbey scripted by G K Chesterton. The social structures, landscape, village development and even the clothes worn by the inhabitants are unashamedly Edwardian/late Victorian. The hobbits are at least 600 years ahead of every other race of Middle Earth. They even eat fish and chips, for Heaven's sake!
Much is written about Tolkien's own view of the encroachment of industrial Birmingham onto the village of his birth and how this is echoed by Sandyman's Mill and the incursion of Saruman's new engines. I think there is something in this. I don't think he's making any grand statement. What we are really seeing in the Shire is a very personal picture of Tolkien's idealised version of home - basically, the one he grew up in. A bit dewy eyed and sentimental, perhaps, but there you go. A leafy, rolling and fertile countryside of pretty little villages, good pubs, sturdy farmers, kindly squires and a working postal system. A sort of never-never land dream of Old England which might have been quite lovely had it really ever been like that.
Regards,
Peter