In applications where wear resistance is the issue (like in planing wood), tamahagane is left behind. For that matter, so is white #1. They are considered finishing planes, because they have a small grain structure and leave a nice surface. But super blue steel and the like, and now powder HSS will plane many more feet of wood before dulling because of the wear resistance provided by the carbides. They are probably easier to heat to high hardness than white #1, too, especially in a commercial environment in large quantities.

I would like to see someone making a white #1 kamisori that wasn't too expensive - and up to proper hardness, but that is probably a lot to ask. Even in the woodworking world, most places producing a lot of something don't like to work with white #1, at least not without charging a lot to do it. There are a lot of better quality makers that will run the hardness of white II up pretty high in tools intended to impact something.

I wonder if anyone has ever done a study of what makes a razor wear, if it is adhesive/abrasive wear or if it is tiny chipping (which is what generally does in chisels).

I see a lot of descriptions of tamahagane with suspect #s of shaves listed behind them. Kzeroukai competitions let the water out of the bathtub in terms of planing (the adhesive wear is something that purified steel cannot resist), but razors may not wear the same way as either, and maybe not even as an in-between kind of thing.

Nevertheless, if the swedish version is 62 and you do get a version of any type of steel that is properly hardened to 66/67, you'll likely be very pleased with it.