Wouldn’t that just be logic gates, Mealy and Moore machines written in text form?

My personal take is: if the code is good enough, it should be trivial to switch to a better library at the point when needed.

I worked in parallel with Sun Microsystems (prior acquisition) IBM and Oracle. All 3 were horrible in that regard. They all offered cheap services, and waited until roots were deep enough; then they would change the billing scheme multiplying fees by up to 25

Same here. I think is intended as “feature” but extremely annoying.

Genuine question: why not?

To start an answer I would say is dangerous territory to say „online must not follow the rules of offline“. My expectantion would be as general principle „onlinity“ is irrelevant. As far as sensible of course.