A new development on this front: Mechanized was used by ClassyDavid himself in the Seasonal Map Cup against oziligath's Ostheer.
https://www.coh2.org/replay/69079/smc-round-1-game-2-dave-v-oziligath
Mechanized is locked in almost immediately. The WC51 is called in at 60 munitions and immediately upgraded. It works with Rifle squads as fire support.
Dave then techs Captain instead of the ubiquitous Lieutenant and rolls out a Stuart. The Stuart fights together with the WC51.
Dave used the more common Recon Support /w Lieutenant build in his match against Talisman's OKW. Nevertheless I'd love to hear more about this Mechanized strategy. Hopefully he sees this thread and is happy to share more about it.