Did tech reduce hiring after Section 174 R&D tax policy changes?

From https://news.ycombinator.com/item?id=45131866 :

> In 2017 Trump made businesses have to amortize these [R&D] expenses over 5 years instead of deducting them, starting in 2022 (it is common for an administration to write laws that will only have a negative effect after they're gone). This move wrecked the R&D tax credit. Many US businesses stopped claiming R&D tax credits entirely as a result. Others had surprise tax bills.

Then companies bought their own stock instead of investing in labor:

"S&P 500 Buybacks Now Outpace All R&D Spending in the US" (2019) https://news.ycombinator.com/item?id=21762582

People just want the same R&D tax incentives back:

"Tell HN: Help restore the tax deduction for software dev in the US (Section 174)" (2025 (2439 points)) https://news.ycombinator.com/item?id=44226145