As you say, it may all be nugatory effort. One might ask...
(1) Do FT employers have a problem finding and proving the competence of TPs and FTEs?
(2) Do FT professionals struggle to prove their competence and experience?
(3) Do people trying to break into the profession struggle to find means of achieving and demonstrating competence.
I suspect that the answer to (1) is not at the "high value" end of the industry, but more often at the "lower value" end, (2) is sometimes but it's not a major problem, and (3) is yes, but a licensing or logbook system alone won't solve that.
And again, anybody moving organisation within flight test is on a steep learning curve at the new organisation regardless of their experience, training and qualifications.
Is this a solution looking for a problem? I honestly don't know. One might ask the same about the various professional societies that we all belong to, but don't strictly need to.
G