Sure, they probably have a reason for using those steels.... But then again, a large part of it is likely due to them being stuck in their ways a little. Based on a couple interviews I read, Jeff almost strikes me as the kind who would use the term "whippersnapper"
Think about it though....wouldn't a 3v ESEE 4 be awesome? The cost would go up, yes, and so would the difficulty sharpening. But in this day and age, not many are going to be effectively sharpening their knives on rocks in survival situations anyway (or have have the ability to do so), and you can get a lansky pocket sharpener with a diamond rod that'll sharpen anything for less than ten bucks..... Just being realistic here.
If I had the foresight to buy a knife as good as the ESEE 4(I did the research and spent 100 bucks on it), I would most likely also have had the intelligence to realize I would need a way to sharpen it in the field, and picked up a lansky before heading out. The type of people who buy ESEE's aren't usually the casual camper or hiker. Around here, those people take Vic tinkers, or sometimes nothing at all. People who buy ESEE's are usually pretty knowledgeable (and semi serious), so it logically follows that they would understand that they needed to have a way to sharpen them.....in which case, they would buy a sharpener...... So I can't really see the logic behind making knives with the whole "sharpen on a rock" thing in mind...
But wait, you say! Not EVERYONE who buys an ESEE actually knows something about knives! Mkay..... So how do you expect them to know how to sharpen their knife on a rock in the woods? You see what I mean?