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Those alloys add toughness and abrasion resistance. 2 properties not very important to a razors edge.
I've used many steels for razors, and I find that tungsten and vanadium only serve to make my...

0.4% is actually quite a lot. 0.4% of tungsten and vanadium each, would have a noticeable impact on the abrasion resistance of the steel when machineing it.

I have found niolox to be EXTREMELY good at inhibiting grain growth during overheating.
I have broken several blades quenched at different temperatures just for the sake of establishing just how...

Yeah but if they do that, how are they going to be able to claim their new and improved wonder steel is so much better than the obsolete last year's wonder steel, when the differences are so small...

Ok, this may be controversial, but I will yes and no.
Yes, if you want to max out on a specific hardness, it needs special HT. Special, as in more difficult than carbon steel.
However, I HT it like...

I don't know about the others, but I have used niolox (SB-1) as razor steel. You can get it from Achim in Germany

As a maker, I can definitely tell the difference between those 3 during the process of making a knife.

O2 is much harder to anneal, but a nice steel to grind and dead easy to HT.
O1 is easier to...

I see. In that case it is a matter of availability. Steels may no longer be available or only available in impractical amounts.

For example i think that O2 is the best carbon steel possible for...

Because most knife steel is not great for razors, are a bitch to work, and difficult to hone.

Also a choice for steel is always a tradeoff and a good knife steel is tough and strong and abrasion...

I'd say niolox. But really, carbon steel is still best and i am glad the steel fad never really caught on