Eventually TPM.exe stopped crashing and I am fine without Support Assist. Dell Update is all I need.
Greetings, Since end Nov 2022 reliability monitor logs app crashes for FirmwareTPM.exe on almost daily base. My system is on TPM 2.0 since purchase. As it seems related to Dell SupportAssist, I have today removed SupportAssist to see if this error goes away. Please share your experience in this and possible remediation. Francis  
XPS 8930, FirmwareTPM.exe crashes