Apollo's Law- if it needs Clan tech to make it useable, It doesn't deserve those resources in the first place.
Sure it isn't the most practical 'mech ever designed, but it's a hundred ton axe-murderer. If loving that is wrong I don't wanna be right.
I noticed that BMM flags the Karhu with "EM interferance." All those lovely targeting computers, ECM's and superchargers are on the fritz for the next turn if an energy weapon is fired. Ouch.