Please read my post carefully. The hidden factory partitions are not used by Windows. One of these partitions is required to run DELL diagnosis tools on boot.They only validate ePSA aka Pre-Boot Diagnosis built into every UEFI OEM BIOS say ASUS,huawei, HP, Dell, Alienware, Lenovo etc... You see, running those tools in Windows have more issues because of faulty/scam/ransomware third party apps, malformed certificates, malformed dlls, AVs blocking OEM apps etc... Basic check is CPU temps exceeding 95C on Windows but its sane outside Windows aka ePSA or Linux at 60C, so user apps are the culprit or even the Support Assistant apps.
ePSA can avoid replacements and save their money.