On the up side, if life is meaningless and a happiness pill without any grave side effects (unfortunately not true for present day anti depressants) becomes available, there is absolutely no reason not to take it.
And before that, it probably implies you can do whatever makes you feel best, provided you have proper discounting in place.
Much like above posters, I can’t see how you could dispute “Something thinks therefore something is”. Since the “I” is not specified in the original text (but it’s nearing 10 years that I read a translation of it so take this with a grain of salt) I would say the substitution makes sense. At the very least, it is the meaning that everyone I ever discussed with was using. (I believe the “I” was merely a self referential concept, maybe like “this” in some OOP languages refers to the specific instance of the object in question).
As for the thermodynamics in Matrix, I faintly recall something about a fusion reactor working somewhere, but that may have been to power Zion, not the Matrix. I agree it is a colossal blunder in the whole series (and anyway, it would have been better if Reloaded and Revolutions were never made, Reloaded especially was unforgivably bad).