To add to your point I think a lot of people underestimate how poweful the green plants have in a true Dutch scape. The most impressive Dutch scapes I've seen use plants like Limnophila sessiflora to get those huge dense green bushes, this creates the contrast to make the colourful plants pop.
I think trying to go Dutch in smaller tanks presents a big challenge in depth. Without much back to front it's hard to do things like streets and also maintain groups of plants that are large enough to be impressive. Also, having enough space for a transition between foreground and background becomes an issue. I think it can be done but plant choice is paramount, as it always is in Dutch scapes, but even more so in smaller tanks.
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On both points, I personally am hitting both. I am very far from anything resembling a scape, much less Dutch, but I have enough going on to begin visualizing what may look good.
For the streets, I am thinking I may just do two green ones, but have them be more substantial than what I see in smaller tanks that are attempting Dutch. I am thinking that if I use similar but different greens, on the same street, that may help getting the look, but also the variety. It breaks one of the many other rules you break when doing it this small, but I am hoping it will give the desired look.
The other thing I think will be likely is to only have one or two plants with significantly different leaf shape. I feel any more and it will be too busy, or just not have enough continuity to be attractive, even though Dutch is about variety, I am thinking this will have to be much more limited.
I am personally allowing myself to go what I will call "modern Dutch" or "garden", which I describe a a nicely manicured, colorful tank, if I can't accomplish this, but I do feel I was never paying attention to just how much green real Dutch scapes have, compared to what a lot of people will call Dutch tanks.