I'm not really a steel snob. I have more than a few stainless, 420 by Buck, a bunch of other stainless like Opinel's stainless, Krupp stainless, and lots of others I am too lazy to look up. I have a custom in 154CM, 440C (I believe), Ast32, Cold Steel stainless quite few like Aus8a, their Sanmai with the VG1 core and a hand full of others. I have a lot of plain old 1095 carbon (mostly in the form of GEC slipjoints). What ever Opinel uses for their carbon steel. I have some 5160 (with a back yard heat treat by me), one by Siegle (though that one was sold long ago), 52100 (by Swamprat), A2 by Busse, INFI, L6 from a custom maker, D2 (by Queen) and 1065, 1055, one 1075?
I'm no expert in anything. I can take any steel I own to hair whittling sharp, though I usually don't take it that far. I'm happy with a relatively sharp edge, sharp enough to pop hairs off the back of my hand in either direction with no pressure.
I don't have experience with any really high end, super steels.
The hardest to sharpen I have used is D2. It really took me a long time to to major re-profiling. Even with a belt sander, it took significantly longer than any other steel I have re-profiled.
In my use, simple carbon steels don't out perform alloy steels or stainless steels in any area, besides being easy to sharpen and re-profile.
I still use it, and buy it. With correct geometry, and decent heat treat it is good enough for me. But I don't do a lot of heavy work with my EDC's.
I don't work in a factory (have not done Agricultural work or factory work for more than 14 years now.
I do camp, and do "bushcraft" (if making fires and chopping down dead wood for the fire, or clearing a path through the stupid Russian Olive trees counts for anything).
In a similar knife, prices being equal, I will take high alloy, tool steel, etc over plain carbon. In pocket knives, I really like D2 for traditional folders, but find that he 1095 from GEC is ground thinner with better geometry than the Queen's in D2 that I have so far. I keep buying it, because it works, and I like the look of the steel as it gets used.
Probably just nostalgia. But I have knives from my Grandpa, and I like the look. My stainless look nicer, and newer even after the same use. I also find that the edge lasts longer on 420 from Buck, ats34 from Queen, D2 (significant increase in edge retention), 154CM (from a custom slipjoint maker).
Simple carbon, no matter how good the heat treat, can't match modern steels (both tool steel, high alloy steels, modern stainless steels, or various super steels) for edge retention, strength, etc.
You can change variables and tweak the steels for different applications (like super thin, very high hardness) for applications that will make the steel less suitable for all around uses.
But you can't make generalizations so sweeping as stainless steels are more brittle, or that they are more difficult to sharpen (I have some stainless that takes an edge easier than my simple carbon steels, and seems to hold it longer with the same profile- like Opinel's Inox compared to their carbon. It is higher hardness, I believe, so I feel like it should be harder to sharpen, but it is not).
Ankerson has more than a high post count. He is pretty knowledgeable in sharpening, and has demonstrated a lot of dedication to testing steels. Significant time, energy, and skill.