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Of course not but I find it hard to believe that most BJJ black belts have high minimal standard.
Look at Rigan Machado competing in Judo competitions in the US. Some of those guys, who probably had black belts for years and competed, look incredibly mediocre even in the stand-up
I'm sure there are weak nations in BJJ where the black belts are equally underwhelming
When Kano started judo, black belt meant you were ready to be a student. That's why Kano (he was a prof at the University of Tokyo) made ten degrees of black belt. Shodan was like being in grade one -- you had a decent breakfall, and knew the basics of moving and throwing. Before that (the kyu ranks) you're in kindergarten, just learning what you need so you can do randori without hurting yourself or your partners.
Expert rank in judo started with the Kokaku belts (the alternating red and white panel belts for formal wear that you get with 6th degree). Again, this makes sense - if you have ten degrees of black belt, you'd expect expert to be closer to the highest rank than the lowest rank.
Somehow, when judo was taken to South and North America, people started to think black belt in judo in meant "expert" instead of "First student grade". That's never made any sense -- why in the world would you have ten degrees of "expert"?
Beyond that, low judo ranks (ie anything below 6th degree black belt) are given for different things. You can get them for coaching, for teaching, for refereeing, and for just being helpful around the club. Again, that makes sense if black belt only means expert at 6th degree. Of course, it takes a lot longer to get promotions in judo if you're not a competitor, and you'll never get to expert rank without competing, but you can become a real if beginning student (ie black belt) without competing.
Since Kano's day, what's more or less happened is that in judo black belt still means knowing the basics, but people have stopped worrying about belts beyond that (at least most judoka). I suspect eventually judo will just drop belt ranks (they serve very little purpose in practice), and like sambo just use them to keep your gi in place.
Even now, if you want to know if someone is good in judo you don't ask (or care) about their rank, you ask at what level they competed. In club or regional tournaments? Probably pretty limited. At the Olympics? Okay, they're definitely good at judo. Belt rank adds nothing to that.
BJJ uses a different belt system (other than the colors, which are naturally similar -- how many colors are there?) In BJJ black belt means expert. That's fine, belt colors and ranks are arbitrary, and every style can make their own. You could start a style where only world champions got black belt. Or a style where you started with black belt and then were given a white belt when you became an expert.