Contact groups are of limited use since it's not possible to use them
in filters.
For example, I might have a contact group for accounting, one for
finance, etc. I'd like to filter and label based on which contact
group the sender is in, but the only way to do is now is make a very
long filter with lots of ORs. Adding a new person is tedious, not
only because the filter gets unreasonably long and annoying to
maintain, but I now need to update it in 2 places (once in the filter,
once in the contact group).
Adding a filter-by-contact-group feature would be a huge usability
improvement, since maintaining groups becomes more effective and more
useful.
Yes please!
+ 1
In case you think someone from Google monitors this forum or this is a popularity contest, take a look at:
https://groups.google.com/forum/#!topic/gmail-labs-suggest-a-labs-feature/Wz55gyU03h4
No wonder we have 106,575 active topics in this forum and growing every day :-(
But...keep on asking, you never know!