> Unless it's basically "shrink-wrapped" software, which largely doesn't exist anymore, software that is delivered by a company that provides that product online and continuously improves/monitors it (i.e. basically all SaaS companies), all software dev should be treated as OpEx, period.

You sure about that? If code written 3 years ago is still in production, that's not an operating expense, that's a capital expense. Kind of by definition. In a mature product, you'd expect expenses to shift to opex. But adding features and improvements are all classic capex. Just like any other industry.