This was just an example to explain why features sometimes disappear. There are many new features in Word 2016, please see here for example:
https://support.office.com/en-us/article/What-s-new-in-Word-2016-4219dfb5-23fc-4853-95aa-b13a674a6670 or
the Word Blog here:
https://blogs.office.com/word/
Nicole, the propganda link you provided lists 7 whole "new" features, compared to the 50 config options one of the earlier replies documented as confirmed as removed. Most of the new stuff is fluff. The "tell me" feature was something I was looking forward
to, based on my long experience with the MS Labs "Search" tab/tool addon. The implementation of "Tell Me" is less than 50% of the Search tool. They "forgot" to include the learning part, displaying the path to the command, so that people would not be permanently
addicted to the feature. <sigh>
As to why no one commented on the missing functionality during the Beta test. Well, it was a beta test. People were not looking to find missing grammar checking and because if they were at all smart, they were not using it as their primary editing tool,
therefore were not looking for that sort of help.
The alarming part is that nowhere in any of the Office 2016 publicity material have I seen that the grammar checker has been replaced, resulting in almost total gutting of the grammar checking feature. Does no one at MS think that this reduction in functionality
would SIGNIFICANT to educators pushing out Office 365 Education and students using Office 365 University?
Finally, I fervently hope that when you do get around to fixing the grammar checker this will not be an update/fix that will be limited to Office 365. It MUST also be rolled out Office 2016 users who bought it expecting at least the same functionality they
had in earlier versions. This "fix" is not adding new features/ functionality that you can rationalize only providing to the subscription users.
PS: could you ask them to make the Grammar settings dialog resizable. I (finally) have 4K monitor and would like to be able to resize the dialog to see all of the options without scrolling. (yes, I know about UserVoice. I've run out of votes ...)