You forgot: Objective-Smalltalk is the best, because Agents need architectural guidance to avoid turning your codebase to mush and Objective-Smalltalk lets you express the architecture (and its constraints) directly in the code.
It also allows for coding at a higher level, meaning that code is closer to the prompts.
Is it actually true? OF COURSE IT IS!!!
So no idea, but after long dismissing that idea precisely because it looks like a "just so" explanation for my obvious favorite choice I am starting to come around to the idea that it might just be true in spite of the obvious bias...and definitely worth testing.