I don't know how a large country functions, but for the Netherlands there is a clear need to invest more in the rest of the country.
I just moved to the Netherlands (in the Randstad) and it's arguably better for the country that I moved to a place that already is dense and efficient to provide services to. Though it would be nice if it were above sea level.
One thing I will say though is that the area outside of it - pick any direction - is idyllic and doesn't seem to be struggling economically. Loads of local businesses, loads of people just going about their day, buying houses, having kids, etc. It's idyllic and I don't really understand why all the activity seems to be in the Randstad.
I mean I do get it, it's a chicken / egg problem; talent travels to the cities because that's where the best jobs are, the best jobs go to the cities because that's where talent is.
But I would like the government to incentivize more "work where you live" schemes; smaller sattelite offices for larger employers, remote work (obviously), extra income and subsidies if you work remotely (because of reduced office costs and to discourage commuting, since our roads and railways are all full up).
If anything it's a good thing - it means investment in Amsterdam benefits far more people than just those in Amsterdam.