Ram rarely rosak. The keyboard, lcd, hinges, mobo will go first.
They soldered the ram so that it could be made thinner and slimmer.

Downside of soldered on ram is that you're limited in the amount you could add, which is none.
Take a look at thinkpad, some still have ram socket.

I dunno mang. Not versed in nitro.
A lot of laptops now come soldered. Non removable battery, no removable flaps for parts upgrade. Just to make it as thin as light as possible.

Thin = flimsy. Most of it anyway.