I have been using mainly KDE on my main desktop for a while now and have decided it is too bloated (e.g., my issue with Desktop indexing with KDE) and was thinking of switching to LXDE because it is lighter. I realized if I want to go light, then why not just go all the way back to before desktop environments and switch back to TWM. I know I can run TWM on my Arch Linux system, but what I am not sure about is if it is viable. I know it is lacking so-called features, but does it support all the core things required to run QT and GTK based programs? Is there a repository of .twmrc files? I know about http://xwinman.org/vtwm.php, but my hazy recollection is my set up was much slicker back in the day.
Is TWM still a viable window manager?
arch linux;kde;lxde;twm
A disadvantage to twm is that it does not appear to implement extended window manager hints (EWMH).  This is not necessary to running contemporary apps, but many of them may exploit this (and I believe the GTK and Qt libraries may, also) -- for example fullscreen mode will require this in many cases, and apps that arrange themselves in particular ways using multiple windows may not be so arranged without it.However, fvwm, a twm derivative that's almost as old but continues to be actively developed, implements much of the EWMH standard.