Why do people like keeping their existing packages when upgrading #rstats? I usually use it as an opportunity to start afresh since installing a package is so easy. What am I missing?

Thanks for the great feedback y'all! Top reasons:

1. No/slow internet
2. Worried packages won't be available
3. Worried packges will work differently
4. Compilation challenges (speed, java, system libs, ...)
5. Remembering github package locations