> (a)(2)(B) be allowed an amortization deduction of such expenditures ratably over the 5-year period
I’m not familiar with this tax law, why would the “be allowed” verbiage here not mean it’s an election the taxpayer could choose to apply to their situation rather than a mandate as the OP is presenting it?
i.e. software development is always an R&E expenditure but you are only “allowed” (not “required”) to amortize it.