The kicker with the line/bane/muta thing is the cost of all of your units. Lings are dirt cheap, whereas banelings and mutas are considerably more expensive. So in order to come out ahead you need to make sure your expensive units are protected/do their intended task.
If 5 marines take out 1 muta and a couple banelings, the terran is coming out ahead on that encounter, even if it feels like a win for you. Upgraded marines absolutely shred mutas, especially with stim pack.
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