It comes up in assault designs like the Highlander, where you can mount 4 SRM6s, an AC/20, and 2 medium lasers, which adds up to 101 (81 without lasers) heat.Managing heat is really easy when you're using tonnage-efficient weapons like SRM's, so it really never comes up in a fight, especially if you build splat mechs without energy weapons.
If you on the other hand exchange the SRM6s for SRM4s and 4 heat sinks you get a relative heat of 65 (45 without lasers) which is much more sustainable, at the cost of 8 SRMs in the salvo.
You can put in a handful of heat sinks naturally if you want armor and jumpjets, but not more than 3 or so, which helps the SRM4 setup more relative to the other one. Either way it becomes a difference between being able to use your main weapons sustainably or having a somewhat bigger alpha strike. I don't think there is a big mech that's better at leveraging SRMs than the Highlander.
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