I don't understand what it is but there is a culture in Ruby/Node to make installation "easy" to the extent that it is dangerous and, worse, offer no documented

I don't understand what it is but there is a culture in Ruby/Node to make installation "easy" to the extent that it is dangerous and, worse, offer no documented alternative. Installing rvm shouldn't add lines to my .zshrc without prompting me. That behavior would be outrageous anywhere else but in Ruby land it's normal.