What Vim features are missing in Emacs with Viper and Vimpulse?

Question

There are important features of Emacs which are missing in Vim, such as the comint mode, and there are no scripts/plugins which can replace them.

There are also benefits

Answer 1

One vi feature that I miss in emacs is the . (dot) command that repeats the last edit. There is dot-mode.el which implements C-. to simulate this but it didn't always work for me (I am not proficient in elisp to figure out why).

Even viper doesn't implement this command exactly like vi does (last time I checked), and even if it does, I don't think that is enough for me to start using viper.