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This is the opposite of today's "You aren't going to need it" (YAGNI). I think the best approach might be somewhere in between.

Yes. This would be "You ARE going to need it" (YAGNI)

The hard part of applying YAGNI is figuring out which value of A is appropriate.

This is like the Halting Problem for Cloud.

Well put.

thankfully there was a flexible future-proof design in place for the acronyms allowing re-use and backward-compatible upgrade.