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As far as I know, ammunition availability is a balancing factor.
The MiG-29 Sniper, which can actually use the R-73 and potentially even NATO weapons like Sidewinder and Meteor, can’t use any of the above. The Community Manager told us this is because the expected Combat Ratio (BR) is 12.7, and adding the R-73 would increase it.
The TKX (P) can also use the Type 10, but because its expected in-game BR is lower than that of the Type 10/TKX, it can’t. It’s silly, but unfortunately, that’s how it works.