It is a personal preference. Chromium does make them more wear resistant, but by my opinion, nowhere near silicon, manganese or high vanadium content steel. I have spend around 500 hours trying to polish a 9260 steel katana with 1μm diamond lapping films following the correct steps, before the jizuya and hazuya, and I don't want to live this nightmare again. The steel has its limits, it can't really get finer than a specific degree.