Concernant le comportement de TI vis-à-vis de l'exécution de code, voilà un commentaire pertinant posté par KermMartian sur ticalc :

As several people (notably Brandon Wilson) pointed out during the key-signing controversy, TI gets a huge brand recognition bonus from the fact that their calculators are approved for standardized tests like the SAT, ACT, SSAT, and GREs. If they were to be less careful about creating a standardized environment across their calculators, chances are that the ETS would be less interested in approving their calculators, and they'd lose a nice source of practically mandatory revenue.