Lenovo laptop quirks

Legion Pro 7i Gen 8 

This generation doesn't support VMD in the BIOS. Even though the option can be unlocked by SREP, there's no way to disable or manage the array since the UEFI setup utility doesn't have that section at all. You will end up with VMD enabled but working in JBOD mode, which is useless. Oh, you cannot disable VMD after enabled as that option will disappear, and the "Load Default Setting" won't touch VMD/Intel RST configuration either. 

Thinkpad P1 Gen 6

This generation would support 96GB (48GBx2) of RAM if you bought it from Lenovo as they use different chips. The ones from Crucial will NOT work if you force-shutdown or blue-screened. The "memory calibration" will simply not end and the laptop won't boot. The only way out is to install a supported module (e.g. 32GB or 16GB modules) to boot, and then change it back to 96GB after that. 64GB will work though. (Ref: https://forums.lenovo.com/t5/ThinkPad-P-and-W-Series-Mobile-Workstations/P1-Gen6-with-96GB-RAM-2x48GB-SODIMMS-Dead-after-BSOD/m-p/5257870)

Do not choose OLED if your eyes are sensitive to PWM light intensity modulation. All Lenovo laptop uses OLED panels that adjust brightness via PWM.  

Thinkpad P15 Gen 2 and P53

This is likely the last generation that supports 3x M2 NVMe with a top-end graphics card (A5000 was the top available). P53 is likely the last generation that supports 3x M2 NVMe + 2.5" SATA.