Been using NotebookCheck for a loooong time but never registered until I've read this post and had to write my opinion, like so many others.
Laptops with soldiered RAM, such as those with starting price 450-500 euro/dollars, are to be considered trash and any such laptop in my mind is prone to faster failure. Look at it for another perspective, not enough QA / QC done on those or serialized and / or pumped up manufacture just so that the companies reach certain shareholder goals.
Have been a power user for 28+yrs and when it comes to new equipment I spend significant time to make sure that "most" of components are good for my use (AMD/INTEL) but RAM and STORAGE upgrades are a must for me. I understand that lot of people want thinner and lighter devices, but coming from the age of "peeking under the hood" or being involved in actual computer builds (read starting to get old or millennial :)) for me soldered components, glued up portions do not make any appeal and I steer away from those as much as possible. I control the flow of upgrades of my electronic devices and I use them in a way that I want until their EOL.
In the end it is a choice just like everyone's else.