Bruksvärdeshyra(utility value) is a tool by lawmakers to punt details away from actual laws, in practice rents become location based so central locations cost more (even if not always as much more as buying would cost).
I checked the laws a bit, the utility value is only mentioned for "disagreements" and the comments explicitly mentions raises as the source for disagreements. Thus when signing an initial contract (as i mentioned) the landlord is free to set whatever they feel like since a tenant would have to agree to get the apartment.
In practice (not by law) landlords are supposed to give a portion of their available stock to the common queue systems, those apartments seem to follow the utility value with some adjustment for location.
However a few years back I was in a separation and since living in Stockholm also a bit desperate and looked at the private landlord queues, the prices were far higher and since I would agree to that initial pricing it would supercede the utility value. Needless to say, I quickly pivoted to buying since that's cheaper in the long run.