I use a slimbook with Manjaro/i3, and it's fast. Far more performant than Macbook Pro 2017 13-inch 16GB with iOS I have to use at work (a bit older hardware to be fair) and 1/2 in price. No freezing, can run PyCharm, VSCode and be on a video call with screensharing + run a pacman install at the same time and I've not been able to get it to slow down even a bit. Meanwhile Mac crawls to a halt with Google Meet or Slack calls screen-sharing.

This is my setup, so a bit different from yours though:

  ESS-15-AMD
  ESSENTIAL 15" AMD
  Memoria RAM 16GB
  Teclado Español
  Sistema Operativo Sin Sistema
  Pendrive No
  Wifi Intel AX200
  M2 250GB SSD NVMe
  Modulo SIM NO
  Procesador Ryzen 5 4500U

  659,00 €

The only issue I have is the touchpad location and style (no explicit buttons). It's not centered at laptop middle, but instead at text part of keyboard middle, but I mostly only use keyboard. Works ok as long as I reconfigure it to count middle button presses as left-click, otherwise I tend to misclick.

Battery life is still about 6-8 hours when using text editor/developing or about 4-5, if watching movies. It's quite heavy laptop, but still fine for couch-slouching. A bit too heavy for travel.

It's a year old and so far it does have some discoloration on plastic, but nothing has broken and it feels fairly solid. The KDE Slimbook you've chosen seems to have aluminium body, so it would probably far outlast my basic plastic version.