Yes indeed, that's why we needed to set the Time Limit on Editing of Posts on 3 days on our vBulletin powered board. I sure hope XenForo gives us the same functionality.
But exactly this time limit function causes serious inconveniences, as I explained here:
http://xenforo.com/community/threads/thread-starter-should-be-able-to-add-posts-at-top-of-thread-anytime-getting-rid-of-the-reserved.6233/#post-136070
... because editing the first posting of a thread by the author of that posting then also becomes impossible.
The new client I am talking to now who is interested in XenForo, is searching for a system that let's their members edit the first posting of a thread indefinitely. You see, they are going (or want to) use XenForo to discuss all kinds of ideas and they will use the first posting of a thread to gather those ideas into a convenient overview-list. So the first posting always is the central point where you find the latest updated overview of all the ideas that have been discussed in all the subsequent postings in that same thread. This already is how I work myself in my own Staf Zone on my vBulletin 3.8 powered website (they didn't get the idea from a stranger ;-). Unfortunately our regular users (non-moderators) can not work like that, because of this time limit we where forced to set.
Is this new client going to face the same problems as we do on our vBulletin powered sites, or is there some way that XenForo can give us the functionality that we can set a time limit (so that most postings are protected) and at the same time grant thread-starters indefinite access to their first postings in a thread? I do hope so, because this has already been one of the most annoying problems for us in the software we have been using for 9 years. That's why I already suggested this kind of functionality 7 years ago...
Forums are used for much more then simply starting a new post and discuss that further. In this day of age (in my opinion that started already 7 years ago) we use forums for all kinds of content-creation/interaction. The first posting of a thread has -ideally- more uses to it, so I dearly hope to see more flexibility in this.