Adding multiple betsizes was one of the first features we added in 2015 - so not very recent, no. The one true correct bet size is a seducing idea but that just

Adding multiple betsizes was one of the first features we added in 2015 - so not very recent, no. The one true correct bet size is a seducing idea but that just doesn't exist for most situations. You can try finding the best one with the assumption you can only use one but it's not the best idea in my opinion. Main reasons are that that's the sizing most people will be most ready to play against and EV difference between possible bet sizes is minimal. What happened in chess is now happening in poker: at first people were all about the best theoretical move and then gradual shift to "not necessary the best just sound enough but less likely to be analyzed by the opponents" started happening. As to the first part of your question: the solutions are pretty much perfect. The only assumption is about possible bet sizes. As to accuracy we measure it in theoretical exploitability (how much a perfect adversary who knows our strategy exactly could win against us). You can easily go so low that even a theoretical perfect adversary wouldn't get close to beating the rake vs the solution, even at high stakes.