Re: Norway in the summer, with perfect DAB reception everywhere
Because they spent a fortune on DAB masts. More than anywhere else. And turned off FM.
It's almost certainly political to benefit NRK.
DAB most benefits National stations with multiple channels. Also car and table top radios, bad for portables.
It certainly wasn't done to give higher quality or save money. You also need a power hungry DAB+ receiver, so not great for portables. Phones with DAB+ rather than FM are rare or non-existent.