It's lazy at a guttural level.
This is 'totally absent product management, even the utterly basic things a regular developer would think to do without professionals to support them'.
This would not even pass muster as Open Source for friends, or internal use.
It takes about 10 minutes of focus and attention from someone who understands the product to make a quick coherent introduction and overview, which is essential and very valuable.
There is no time/value trade-off equation where it doesn't make sense to provide that.
* This is from a company trying to convince us that their AI can automate many jobs *
It's almost disturbing is that people could see this otherwise.
"Our AI will dramatically improve your productivity but we can't even leverage it to do the most rudimentary and basic things" is a message that implies a lack of credibility.
It could easily have come out of an implementation call with a large customer who needed exactly this. They built it, it serves that use case, and they made it public. Neither of us knows. It's not the official codex CLI. It really doesn't matter.
Take that stick out of your ass.