This is the definitional difference between an acronym and an abbreviation. And it suggests a criteria - use domain specific acronyms if they’re deeply universal, but don’t use domain specific abbreviations even if they’re commonly used in writing:
That lines up with the mental overhead model as acronyms have an identity of their own - you’re not spending any mental energy to expand them. Abbreviations on the other hand tend to be expanded by the reader when read.
It’s the difference between LASER (does anyone expand that in their head when they read it?) and NVM (which I can’t help but expand to “never mind” every time I read it).