Yea, but I also think it's more complicated than that. I would think that if you already work for a FAANG or other well-respected tech company, that would de facto serve as your "professional certification" and help avoid these ridiculous interview processes. If you work at Google as a SWE, then you've already passed a pretty high bar to become a SWE and when you apply somewhere else, ideally they would see you can pass that bar and not ask you to leetcode your way over the bar again. But IME, that's not the case. I know some FAANGs that, even when doing an internal transfer within the company, still require you to go through the full leetcode interview process.

There seems to be some kind of inherent or cultural distrust amongst tech interviewing, where nobody trusts that anyone has tech skills unless they personally verify it. I don't think a professional exam/certification would solve this distrust.