Those are not really great construction examples, are they? Both projects took 15+ years to complete with huge cost overruns. And for those two "successful" projects, you can find 2 or 3 that failed.
The Finnish reactor had one delay because the concrete used for the containment building wasn't of the 'nuclear grade'. That's why those regulations thankfully exist.
Building more will help though. This whole thread started about how we had lost important knowledge