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

Incremental search using / and ? is missing.

Answer 2

To get a complete list of what vimpulse may be missing type

:helpgrep not in Vi

Every feature in the help that is not vi compatible will be listed.

Theres about 700 matches.

Of course there will be a lot of duplicated functionality