The problem with any single plant is it will only flower for a few weeks. Bit like people putting their bees in orchards - a source of nectar for a short while - then nothing.
Not that there is anything wrong with putting bees in orchards - I have some, but they are not there for the nectar, only the position with respect to the surrounding countryside. Any blossom nectar is a bonus, of a sort.
However, (I love that word...) this is not to decry someone planting flowers in their garden for bees and taking pleasure form seeing the bees work them. My bees go mad over the Sedum late in the season, just don't expect a few plants to keep the bees alive all year.