[iudqnolq]

I don't think that theory works out in practice because they have not that many seats in the trains, a lot of vendors, vendors that book very small and irregular numbers of tickets on routes, and sometimes very few or no extra seats. So you'd need to reallocate the blocks by demand quite frequently, at which point it's morally a shitty centralized system.

And with every clever decentralized solution there's another feature request that adds more complexity. I just remembered some trains have displays above seats that tell you if it's reserved.