You don't use open source software because it's better (it usually isn't).

You don't use open source software because it's freer (it only sometimes is).

You don't use open source software because it's got better politics (it isn't always).

You use open source software because *it is the only option*. In the long run, if it isn't open source, it doesn't exist.

image source: keithstack.com

As someone who was a true devotee of FutureWave SmartSketch (which became FutureSplash Animator, which became Macromedia Shockwave Flash, which became Adobe Flash, which became Adobe Animator) my sorrow is incalculable. Every day I long for software I had in the 90s which I can't find anything as good as today.
@mcc I was also a true devotee, but my grief ran its course more than a decade ago.
@mcc I can still get extremely nostalgic about it though.