T460s only has partially replaceable memory, some of it is soldered on. And god help you if that fails outside warranty, spare Thinkpad mainboards usually cost more than a new laptop.
I've opened the machine and it's a shame they don't just give us 2 DIMM slots and 2 (or 4) M.2 slots so you can just splurge on some more RAM+SSD goodness.
Lenovo's model policy is somewhere between "annoying" and "fucking insane", every laptop is seemingly made by a different team and none ever talks to each other.
Lenovo's model policy (23 different Thinkpad models this year with dozens of options each) is really insufferable.