You need to consider the upgradability aspect too - the next time you want to upgrade, you just need to buy a new mainboard, which would be considerably cheaper than buying a whole new laptop.
A new mainboard that may need new memory. From another comment in thread:
I have 64GB of DDR4 in my current laptop, and replacing that with the same amount of LPCAMM2 LPDDR5X is probably more expensive than the rest of the laptop itself.
And another:
I just had my mainboard die, and I was advised there currently isn't another mainboard in stock that works with my old DDR4 RAM