I can imagine why you seem to dislike that phenomenon,
But in my opinion it's a good thing, after all, in business, or any type of project, failing is the first lesson, so asking people not to start failing is like asking them not to start succeeding : )
On the other hand, I agree about the fact that newly formed teams need to plan ahead of time, and be as realistic as possible about what they can do and can't do, and also always track their own performances in that context.
Other than that, best is to put forward one's best work, be it in a team or not.