Sucking at a process is part of learning to do it better. But only if it is on a path of learning; practicing the skills that will be useful later.

They’ve stuck with DUV, which everybody else in the world decided was a dead end. Sticking with DUV may cause further progress to be impossible for all we know (maybe somebody should ask Intel). Going to EUV will require a different set of skills. They’ll have to replicate ASML’s machines to do so. Nobody else has figured it out. Their process on figuring out DUV tricks doesn’t tell us anything about their progress making that other type of machine.