Historically, Section 174 allowed everyone to opt in or out of R&D amortization. That amortization is required from anyone for R&D is new.
Further, software is the only type of R&D explicitly called out as required to count as R&D. Which means it should be taken as a given that most other industries are finding ways to count their R&D as anything else, while we've been intentionally given the short straw for some reason by having our specific field be the only one identified by name so as to leave no wiggle room. I'd say that definitely counts as being a special case. The section is even labeled "Special Rules".
Further, software is the only type of R&D explicitly called out as required to count as R&D. Which means it should be taken as a given that most other industries are finding ways to count their R&D as anything else, while we've been intentionally given the short straw for some reason by having our specific field be the only one identified by name so as to leave no wiggle room. I'd say that definitely counts as being a special case. The section is even labeled "Special Rules".