Not necessarily and depending on how much you will later move your head, for example for monitoring usually small distances are recommended.
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Most folks here are not monitoring but listening, and most of those who monitor are professionalists who don't need our advice how to spatially average when doing room EQ.
Btw, shoulder width of that sofa is more likely to be larger than 60 cm, certainly not 30cm, otherwise you won't be able to fit in it.
Regarding moving my head, I like to enjoy glass of wine and a cigar while listening and that accounts for more than 30cm of movements. I'd say it's the same with most of the people as nobody probably uses listening chair with seatbelt.
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