Take care to only solder in an open environment. Those fumes can be nasty. Buy a good solder sucker from an electronics shop, they are cheap and would save you countless hours.
I should also mention that their support is top tier. One of my ThinkPads had 3 dead pixels and they send a repair person within a day of reporting it when I was in a village area in Gujarat.
I recommend the ThinkPad if you truly value good keyboards. I refuse to purchase any other laptop (used to use MacBook) after getting one. They are also easily repairable if something ever happens and the official site offers deals from time to time regularly.
If you want OS upgrades and monthly security updates, you can also look into getting Oneplus 8T which has excellent custom ROM support. You'd need to flash Magisk to hide your unlocked bootloader from some apps, though (Paytm etc work without Magisk right now). If not, then S20FE is a really...
https://cultists.network/140/psu-tier-list/
Pylon is a low tier PSU. Other PSUs like Cooler Master MWE Bronze or Deepcool PM Gold series are much better while being in the same price range.
OLED burn in is no joke. You are pretty much relegated to using dark wallpapers too because colourful ones have higher chance of burn in and they cause higher battery drain (on a mobile device). And the burn in serves as a cruel reminder forever.