Note that Trump's Big Beautiful Bill as it passed the House of Reps would bring back 100% expensing of R&D expenses including software development costs/salaries.
If the article is to be believed, though, the damage is already done. Companies have already laid off large portions of their R&D staff, and have canceled lots of forward-looking technical work. Re-hiring those people and restarting those projects can take years, and that's if companies feel confident enough that the exemption will stick around, and not get removed again in a few years.