Dutch-style bikes are not only very heavy, but the upright position is also not good for speed. They have other benefits though, the posture gives a better overview of traffic, lowers the chance of back pain and this type of bike generally requires less maintenance (e.g. my wife's Dutch bike only needed one repair in the 10 years she has had it, while it has been parked outside in the rain/snow some years, when we didn't have a garage).
That said, Dutch-style bikes are not for me. I like trekking bikes, which often have a good trade-off between speed, weight, stability, and lower maintenance than most road bikes (especially with belt drive and a gear hub). I also have a hybrid bike, which is lighter and faster, but I don't really like the amount of maintenance it requires (regularly degreasing the derailleur) and it feels less stable than a trekking bike.