money and destruction
the killer on the chrome moly arms is if you can't keep out of the rocks, the next hit ususaly will take your bulkhead............and the arms.
The soft gushy water pipe arms are there for a purpose, to protect riders from themselves.
We've all dinged our arms and most of us are lucky to just replace the arms and not restitch up a bulkhead. A lot of the after market arms are way stronger than stock and a little lighter. but don't be taking any direct hits.
I've built arms super light, and super strong, and had the best luck with the super light very thin wall chrome moly arms cause when I hit the unmovable the arms snapped, and I limped home. When I made the indestructable chrome moly arms, couple of guys came back with their arms intack, spindle and ski still attached and right side of M series bulk head missing.
When you hit the stockers, they usually bend, mush up, take your shock rod, $225 and one evening back in bussiness, your choice.