This a huge, extremely serious situation. I don't say this lightly, because the whole system could collapse at any time.
"The IRS does not have adequate information technology (IT) systems to do its job effectively and efficiently. The IRS’s core IT systems are among the oldest in the Federal government, limiting the agency’s capabilities in significant ways. Partly due to historic poor planning and execution and partly due to lack of funding, the IRS has been unable to replace its antiquated systems. Every year, instead, it layers more and more smaller systems and applications onto its core systems. By analogy, the IRS has erected a 50-story office building on top of a creaky, 60-year-old foundation, and it is adding a few more floors every year. There are inherent limitations on the functionality of a 60-year-old infrastructure, and at some point, the entire edifice is likely to collapse."
From -
https://www.taxpayeradvocate.irs.gov/wp-content/uploads/2020/07/ARC18_Volume1_LR_01_IT.pdf