These people play around with shit and try to sell you on their secret sauce. If it actually works it will come to claude code - so you can consider them practical SOTA and honestly just plopping CC to a mid sized codebase is a pretty great experience for me already. Not ideal but I get real tangible value out of it. Not 10x or any such nonsense but enough to think that I don't think I want to be managing junior developers anymore, the ROI with LLMs is much faster and significant IMO.