I have to disagree. Imagine Japan building a micro in western China or the Novosibirsk area. That would allow a quick overrun of the unprotected Soviet territoriies while the Russians are cornered in Moscow. It tales a fast unit four turns to get from the Chinese coast (where factories can be built) to Moscow, while a micro could bring troops to the front immediately.
Even a micro in the Shan State or Yunnan could be detrimental to India simply because of the added range. Though a micro is not as economical as a minor, it gives Japan a privilege it rarely ever gets early on: building inland.