I used to have a IBM Thinkpad many years ago. I loved it!! it was not only quite thin .. it was pretty light too. The only think i didn’t liked about my ThinkPad was the little red button in the middle.. that you used as a mouse to navigate.
Many years ago.. to upgrade and make your Thinkpad run faster and to add some IBM memory was quite unthinkable.. because it was so expensive. Fortunately, with the technology these days, upgrading any computers are affordable, fast and easy.