Yes, the IJsselmeer is one of the better "training grounds" in Holland. The only easy thing about it is that there's no current
and tides ;-)
When I was about 18, I trained 6-10 year old Dutch girls sailing Optimist and Laser after that. Some of them drop out but at least 80% ended up racing
the Laser, 420 etc. and it's a familiar sight when Dutch girls bring Olympic gold back home. The parents of all of them have their sailboat and they sail that too of course (finding it somewhat boring compared to their own boat).
There's two groups of people in Holland, like everywhere else: sailors and landlubbers. The difference is that the group of sailors in Holland is much bigger and they spend all their time on the water
.... there's enough of it. It's a rare occasion that you enter a bay or marina in the cruising grounds (on and off the beaten path) and there's no Dutch boat there. But there's only 16 million Dutch people in total, not even the same as a single
big city in the US.
Later, we met cruisers with kids
who were born aboard and never lived ashore. These kids
are different, sailing is like breathing for them, they don't even have to think about what to do (and I'm thinking of a Canadian family
here so it doesn't matter which passport they have ;-)