Its certainly one way to try to slow Japan down. The extra territories for you (and less for Japan) does a couple things, 1) it reduces Japans IPCs and increases yours which is a swing of a few infantry and 2) it forces Japan to take more territories before it can threaten Moscow. Its a gamble if this is a better way to play than simply stacking Russian infantry in Yakut, then backing up to Novo but I think the allies are better off attacking than defending.
What also sometimes happens is 1) Russia takes Manchuria, 2) UK takes Kwang via the transport from india. Then on US1, the US takes FIC if possible after J1. This results in Japan having nothing on the mainland after R1. To counter this in a bid game (though I’m not really an expert on playing with bids), it is typical to add an inf or two to manchuria so that the odds of Russia taking this is slim.
So I’m too stupid.
I don’t think you are stupid.