I do think the unsatisfactory (to many people here) answer is to assume that if you graduated from the right schools you're probably OK with respect to certification.
What happened to DRY. Just take it once and have it be recognized by all.
It's fascinating how many people in the software industry want the title "Engineer" but don't want benefits of the title like standardized tests and ethics boards because they are afraid of standardized tests and ethics boards.
1.) "Every time" is 10+ years apart for a lot of folks
and
2.) If you look at the requirements for things like PEs (at least the last time I looked at them), you have requirements like 4-year degrees, having worked under a PE for some number of years, etc. in addition to the tests, which I assume a lot of people here would object to.
2) Surely an attempt at standardization in this industry, like the similarly hypothetical pipe dream of a widespread software tech worker's union, would include adapting to the unique characteristics and mores of the industry? There's no need to fully copy other disciplines' practices in complete detail. Though we should include the ring ceremony, that would be cool.
The whole point of this is that Leetcode has essentially become a de facto standardized test for many many jobs in this industry, and if we are to recognize that reality, we might as well make it DRY.