MIcrosoft has made it clear their secure boot key is expiring, My Dell XPS 9570 UEFI was updated a while ago but AFAIK my machine spews no errors installing Windows 11 25H2. Windows 11 seems to more stable but updates and other issues push me to install Windows clean. 

My i7-8750H is strong. I installed 32GB DDR4-3200 and the WD SN580 2TB handles the OS and applications. AFAIK this machine with the UHD LCD is still way better than more recent trash with poor graphics quality. UHD panels are expensive.

I hope Dell keeps the certificate updates available in case of a problem.