I used to live in the Netherlands, now in a major US city. Always biked to everywhere.
Dutch bikes (price/use vs price/use) are absolutely heavier, noticeably so.
I spend about 1500 on my daily bike. The average Dutch Bike in the Netherlands is ~12-14kg. My bike here in the US right now is 9.6kg. My nicer bike is 7.8kg.
Like others have mentioned, _it matters_. My ride has significant uphill portions both ways (due to one way streets). It sucks on a heavy bike, and it sucks on a bike without fairly aggressive gearing. Carrying the bike up 8 flights of stairs is not fun, and throwing on an extra 3kg after a long ride is... ick. Not to mention the top tube design on some of them makes carrying a Dutch Bike more difficult.
It wasn't mentioned in other posts, but riding upright going uphill is rather unpleasant as well. Trying to overcome that discomfort with a lean on a "Dutch Bike" just compounds the discomfort.
To the other points - Streets in the Netherlands were flatter. Bike theft was MUCH less problematic. Climbing stairs to get to your home was less common.
None of these things are a knock on Dutch Bikes. It's a different tool for a different place.
Maybe if you're commuting in Kansas, Texas or Florida then a Dutch Bike makes sense. If you're in a major American coastal city then it's unequivocally the wrong choice.
The OP's point stands IMO: buy the right tool for the right job.