If you have ever used TWM, then you would know that the 'T' stands for Terrible. Fortunately, there are lots of lightweight WMs that are far better.
Personally, I use tiling WMs (namely XMonad at the moment), so I could really care less what GNOME, KDE, et al are up to. However, I realize most people are accustomed to stacking WMs and expect something similar to what is provided by proprietary OSes with a similar amount of eye candy as well.
Hey now, no need to resort to name-calling. In fact, the “T” originally stood for “Tom”, but the name was later changed so the “T” stood for “Tab” (referring to its then-default look of window titles as little tabs on top of windows).
Furthermore, it is not terrible. I’ve used TWM for more than 20 years. It worked perfectly fine for me when I started to use it, and it still does so today, so I have not seen a need to switch.
