This article wasn't fair on the old VIC-20. This was my first computer and obviously the writer was a bit hazy about what computers were competing with the VIC at that time. In the UK, the main competion was the ZX81 which was monochrome, had a membrane "keyboard" and came with a whopping 1KB of RAM. Suddenly the VIC's 3.5KB looks huge.
According to the article, most other computers came with "16KB of RAM". Hmmm... if I remember correctly, a 16KB RAM was available for the ZX81 at a cost of about 3 times that of the computer and due to the iffy connection to the computer (it looked like a pack of cigarettes stick onto a VHS video tape when attached) it could cause the ZX81 to crash if you jolted the computer.
Anyway, I used my VIC with a "Super Expander" for an extra 3KB of RAM (I think), additional BASIC commands and "high res" graphics.