Couple things. All engines require a minimum of 10 heat sinks in the mech in order to function How many heat sinks can fit inside the engine is...
so, they are fixing a bug that calculated the heat generated by lasers as heat per second of duration(Heat times duration) instead of just heat.....
Easy... Almost every other weapon besides LRMs can be aimed and they converge where you are aiming. That alone makes up for double armor, in fact...
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