I feel like this is kind of a response to the complaint from his last article that Slaadi and Modrons don't fit into the Celestial/Fiend dichotomy.
I feel like calling one a construct and one an aberration is a little like calling a Pit Fiend a "humanoid" or a genie an "elemental." Yeah, okay, I can see what you're saying, but
they're not really the same thing, are they? Slaadi aren't Lovecraftian horrors. Modrons aren't artificial life given an artificial soul. These things are different. I'm not against it per se, but it seems like you're kind of making both terms a little meaningless.
"Er...Aberration is anything involving body horror...except a medusa, I guess? And, um, Construct, that's...yeah...anything made of metal or clay or wood or I guess flesh with a flesh golem but not undead and also these immortal things."
It's really just a vote in favor of getting rid of these "types" all together in my mind.
I also think that the noble attempt to dislodge modrons from their place of alien entity is misguided. Part of the appeal of modrons (slaadi, too!) is their alien mindset, how they fundamentally conceive of the world differently, and their "drone"-ness is part of that, as is their hard-wired Lawful sense. I don't see modrons as a self-policing force, always worried about someone bucking the trend, I see them as mostly outward-looking, seeking to police and understand
the rest of us.
Which is why Rogue Modrons (or "Outcaste" modrons) occur: sometimes, one of the drones just can't quite comprehend the outside world's chaos.
I don't get "goofy" from their appearance, generally. I get "alien." I get "this thing has warped its body to resemble the fundamental order of existence, its biology is something esoteric, it is not a natural creature of my world." Hell,
modrons might be good aberrations.
I'm not interested in modrons that act like normal people, or modrons that don't represent order in their body form.
The slaadi changes seem less extreme to me. And OF COURSE I want Slaad lords.
Like the wise people above said, stick with the Planescape version. It's a
good version. If someone doesn't like the modrons because they think they're silly, that's fine -- not every monster needs to be usable by every player.