Having run the workshop at the local Dolmar / Husky dealers for over 8 years I will agree that a lot of saws are damaged by dull or totally blunt chains, over heating clutch, burnt out engines you can usually tell as soon as you see the casing full of sawdust.lol
You never said half the cutters were missing just filed back.If I have a customer that aint to proud to admit that he cant sharpen their own chain I take them in the workshop and give them a quick demo of how to file a chain. Its usually farmers not forestry workers that struggle,but most wont admit they dont no how!
It takes no time (less than changing a chain)to touch up a chain every tank or 2 and you have a razor sharp chain (usually sharper than a brand new stilhl loop straight from the box,yes I only run stihl or oregon chain the only difference is the stihl cost more) and you need a sharp chain when cutting oak all day!
Advantages
dont have to carry 6 chains just a file
Have a sharp chain for every cut
When I get home I want to sit down not spent 1/2 hour in workshop sharpening 6 chains and digging out all that sawdust that clogs up your saw!
And just for the record I didnt run the crew just worked with a good bunch of cutters.Over here it was all self employed piecework getting a couple of $ a tree , you supply your own saw, fuel, oil, chains files and anything else you might need so you make things last.
Most guys just learn to file there chains well and have no need to walk around with a pocket full of chains.
opcorn: