If those "corporate patent people" are lawyers, they're betting their law licenses: Intentional withholding of material information can result in the patent's being held unenforceable for that reason alone [0], and quite possibly temporary- or permanent disbarment for any patent attorney found to have engaged in such misconduct. [1]
[0] See, e.g., https://casetext.com/case/deep-fix-llc-v-marine-well-contain..., in which a highly-regarded federal district judge in Houston held that a patent attorney had intentionally withheld material information from the patent examiner; the case is discussed at https://www.ipwatchdog.com/2020/02/26/inequitable-conduct-li... As another example in which patent attorneys were likewise held to have engaged in inequitable conduct, see https://scholar.google.com/scholar_case?case=455051935074519...
[1] See generally the discussion in an amicus brief (search the document for "disbar), at https://www.supremecourt.gov/DocketPDF/17/17-1616/52679/2018... (the Supreme Court denied the petition for certiorari, as discussed at https://www.patentdocs.org/2018/10/supreme-court-denies-cert...)
This is basically "pretty please". If something is uncomfortable it's not "material to patentability" according to corporate patent people. (Including me sending them "hi, look at this prior art")