This is... A little upsetting.
30 year net/sysadmin and custom builder here. Of course I know how to apply thermal compound, but this GS77 12UHS we just bought is hitting 90-100c(p cores) during basic operation, such as windows updates, other installs, low-end games. No computer I've ever built, nor laptop I've purchased, has hit above 80c in any component during normal operation, and if this requires a "re paste", MSI will either be replacing this device now, or they will be doing the repaste for me.
I will NOT spend 3 grand on a last gen laptop that can't cool itself adequately, nor will I be cracking it open to fix their problem myself. Nor am I willing to reduce performance below stock - perhaps I'll be getting a refund if this machine is defective.
How can anyone take this seriously? You don't re paste a laptop CPU or GPU cooling system yourself when a vendor sells you a lemon... The OEM is responsible.