Interestingly I think that’s like the default move that the computer opponent does if assigned to play Allies. Not that I’d suggest following the machine for much, but who knows might be something to it that most have neglected? I think its just the high cost for the Russians vs what Allies are likely to get out the deal long term. 5 inf for 15 ipcs is pretty pricey for a bait, and parking a Brit fighter to back it up takes that up to 25 likely destroyed. I don’t know could just be me, but if Russia stacks Bury without a Brit fighter I will always try to smoke it on J1. If they do bring the fighter then the profit for the Bury attack starts getting closer to Pearl level trade off (such that J might consider leaving 53 alone to pull it off). Japan can also run a hit on 53 with the sacrificial fighter coming from sz37 instead of Tokyo if they wanted, and still land the Bury fighters on deck in sz60 after.
4 inf 1 tank 2 fighters 1 bombardment vs 5 inf 1 fighter is still like 80% to the attacker with 2 units remaining on ave, 3 if attacker won.
Every now and again that might break unlucky for Japan with a dud or something, but most times they blast through 6 hitpoints like it was nothing, and then the north is open road for the rush to Evenki line. Obv the plan for that to have much pay off would be like full on KJF slam trying to break the Japanese in the first couple rounds. For a fast game high stakes might be fun, cause there’s only so much Japan can do in their opener. If I was Japan I’d prob just bring the bomber into it, and focus north initially instead of Pearl, cause it would really suck to get rolled on the mainland immediately. Or like you mentioned, also possible to ignore the Bury stack and just bolster manchuria on D, delay of game tactics for both sides hehe. But on balance I think its just tough for Allies to have Soviets leading the charge in the East, when they are already struggling so much just to maintain vs G onslaught, and then not having those Siberian dudes to back up the middle path across China or as a life line to bolster the center in the 4th round. This based more on the A&AO situation which is slightly different from the physical board, with no bids and such to help the set up beyond the Gencon tweaks. Then again its just kinda speculation, I haven’t seen enough games where players tried for the Bury stack to really know the ultimate trade off. That’s a strong telegraph for KJF, so as G I would just go for broke in the opener I think, and play for the fast game on the center.