It doesn't make it harder to "write off R&D"; it stops bullshit accounting practices by tech firms and forces them to capitalise and depreciate rather than expense stuff that is obviously capital in nature (unless you think code is ephemeral and needs to be rewritten daily).
The problem is code is a lot more context sensitive than most capital expenditures. If I pay for a machine that makes really good chalk, then when my company eventually folds that machine is still probably worth a fair amount to my competitors. In contrast, the code I wrote today which probably is going to save my company ~200 man/hours a year is almost certainly completely and utterly worthless to literally anyone else, because it automates a hyperspecific piece of a company-specific workflow.
