Not sure if those saying its too thick and clumsy have noted that the description states that the blade has a distal taper and that the tang is tapered, so the only place the stock is 5mm is at the blade/handle junction, maybe just a bit forward. I would want to see a picture from the spine before I absolutely hung my hat on that, but it is what is described. That could make it handier than the old Woodlore.
I am interested in the handle thickness too. That was a place that the Woodlore scored over knives that used Micarta, which is typically available in only in 1/8, 1/4, 3/8 and 1". Hard to make a hand filling sculpted handle when the material is only 3/8. Maybe they have sourced something that was thicker. I am sure it will be comfortable.
As I have got older I have become less bothered by the price of things like this. Value is a very subjective thing and people who are in business have to price to their market. You and I might not be that market. If they are selling a name as well as a product, people will pay more than the base cost of the materials and maker's time, maybe just for confidence that the design will be better thought out and tested than from someone without the same bona fides. If no one buys, then they either drop the price or stop offering it. Such is the way of the world and criticising it is kinda a waste of breath. I am not in the market for a fancy watch, or any designer label clothing either.