I honestly don't understand how you read this "nuance" into the original comment. They don't say that GPL/LGPL is absolutely better than MIT/BSD, and they speak positively about the project. There is no comparison here.
The switch from GPL/LGPL to MIT/BSD loses a specific set of restrictions that are "encouraging organisations to release their code under a similar license". This is a specific societal good that is being lost. Even if you don't think that it's a big deal, I can't imagine anyone reasonable saying "literally everything would be better GPL/LGPL" - objectively, the public wouldn't be guaranteed to have open-source-free access to so many products. You can argue that there would be more products or whatever you want, but unless you're taking an absolutist stance, some societal good comes from these licenses.
The only way to arrive at a comparison here would be to ignore the context and the chosen wording by the OP.
You're only seeing the alleged benefits from GPL, without factoring in its costs. Everything is a tradeoff. Some companies don't touch GPL code, which means those projects receive less support than they would with a more permissive license such as MIT/BSD. You're claiming GPL "[encourages] organisations to release their code under a similar license". I'm saying it often discourages organisations from ever touching GPL code and picking other libraries instead.
People have been writing about this in way more detail for a long time. If you're really trying to understand some position you can't possibly fathom and not just argue, then I'd point you to one post from 15 years ago: https://sealedabstract.com/rants/why-the-gpl-sucks/index.htm...
No, I'm not only seeing the alleged benefits, as I clearly explained in my previous comment. MIT/BSD brings their own societal good, but it's a different societal good, and it's not an equivalent societal good. Just because you gain some societal good doesn't mean you gain the exact same societal good. Unless you're trying to misunderstand OP, it's not a hard concept.
GPL/LGPL has advantage A. MIT/BSD has advantage B. A and B are different. Even if B is greater than A, it still doesn't mean that A is a subset of B. You keep acting like the only thing that matters is |A| and |B|, because you're somehow fixated on this being a comparison.
Try re-reading the original comment without adding in words like "marginal". You'll see that there is no comparison made between societal goods.
