I'm also feeling strange & unsatisfied about Russia's display arrangement.
Why always showcase a T-50-4 prototype with poor craftsmanship on airshow? Don't they have a better-looking serial production aircraft? I know the total quantity is fairly low, and they're in an intense war with Ukraine. But even a single in-service aircraft can't be spared out? Do Russia even care about PR, or just their available/flyable Su-57s are far less than we expected?
If they sent a better plane, PR would be easier, also clients would be more willing to buy.