The question when evaluating long-term claims is whether there are shorter-term benchmarks specified. I'm not an expert so I don't know what specific short-term benchmarks make sense. "70% by 2030"? "Implementation underway by 2025?"

I do think it's best for the law to be a broad "this is the target" with the nitty-gritty "how to" being figured out by experts. The target should have been established by asking those experts, but I want the people tasks with implementing it to have flexibility to update the plan if things change.

If a highly-prescriptive law has been passed and suddenly we have a major breakthrough in fusion/batteries/etc., or a geopolitical event suddenly changes the availability of certain resources, the implementation details should be adjusted without having to run back to the politicians for an updated law.