Well, it does make sense if one your guest machines is sip pbx or an home automation console which gives voice prompt about various things and you want an headless system which is not alwayes connected to an rdp client.
Why not put it as an option and if one decide to use it, he/she could.
Not all guest mahines are database machines there are some other uses...
qm set VMID -args "-soundhw sb16"
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