The EPR and AP1000 reactor designs were supposed to be the end of "designed for the site" reactors, and they were. The same designs get built at different geographic locations. The problem is that they're no better at meeting cost and schedule targets than older reactor designs. They're still late and over budget.

Can small modular reactors like those designed by NuScale do better? Maybe. But we're not going to find out sooner than 2030, which is when NuScale plans to have its first plant operational: https://www.nuscalepower.com/en/about