Agreed on those points.
The Dutch roundabout you linked to is single lane and has a wide circumference. For drivers, it has the feel of yielding (or even stopping) to make a right turn and then taking it to where you want. Reasonably safe.
The problem with many of the ones in the US, is that by altering the geometry, the circumference, and the number of lanes, you basically are dealing with a manuever of handling 4 closely spaced one-way intersections. (I.e. a town center intersection but where everything is really close.) You yield to the first intersection and then you have the right of way in the others. But the problem deals with that you don't know when it is safe, because you may misjudge if traffic on your left will exit or go straight or continue around the roundabout.* And the straight move isn't such a great deflection, so some traffic isn't even adequately slowing down.
IMO, if traffic can be narrowed to single lane on all approaches, a roundabout could be an option that will eliminate delays from traffic signals. if it doesn't and you need multi-lane, you also likely need a traffic signal.
* To some extent, you experience similar problems on multi-lane 4-way stop corners. When those are busy, the only way of being safe is keeping track of which direction got to the intersection first. But it is harder to do that for multi-lane approaches. IMO, if a road is busy enough for multiple lanes, it's busy enough to require traffic signals. If it isn't busy enough, then narrow the road.