Has anyone here ever experienced a catastrophic failure with a full-tang fixed blade -- cheap or otherwise?
I've never had catastrophic failures with any kind of knife. I have some knives with large chips, nicks and scar - but an ugly nick does not render a knife completely useless.
Sure, my Bark River Golok or Bravo-1 could chop a tree branch easier than my Moras (are those partial or full tang?)
All moras (that I know of) are partial tangs. They are often used as prime examples that partial tang knife, while not as strong as full tang, may still be highly functional, strong, durable - and cheap.
But then again, it could be argued that heavy batoning is not something the mora is designed to do. Real hardword is not that common in Scandinavia (except for oak, but there is an abundance of better bushcraft alternatives everywhere in Scandinavia). Different location = different wood = different tools.
I don't carry any kind of knife sharpener in a pack and wonder if I should. And whether that should be stressed when carrying a cheaper knife that may not hold an edge as long as others? Seem to recall there are some pretty compact knife sharpeners around.
Good point. I have a "butterfly" design diamond sharpener that isn't overly heavy, with a medium/fine grit. Just the right size/efficiency compromise for a quick sharpening in the field.
The good thing about bringing a small sharpener in your pack is that you can enjoy a little sharpening quality time when you are exactly where you want to be with your knife: In the woods. Added benefit is that frequent quick sharpening will de-mystify the obtuse sharpening rituals and terminology.
Scandi grinds (which most mora's have) are quite easy to hand sharpend because the large bevel gives a large surface (contact area) between your stone and the bevel.
In the end, sharpening is all (or at least, mostly) about removing metal in the right place.