I don't know where you're getting this impression from....but to answer your question, I DO consider them musical compositions (whether they are "worthy" or not is subjective).
As to the minimum length requirement, I've listed out my reasoning below:
1. This is NOT a contest for miniatures, never stated anywhere that it is. From what I understand, "miniatures" can be as short as a minute and as long as 5-6 minutes. I also gave the option of submitting multiple movement works to meet the 5 minute requirement, so I don't see the issue in all this.
2. The competition was announced in the middle of May, and I set the deadline to the middle of August. Entrants had THREE months (and still have less than a month) to come up with an entry. If the timeframe for submission was shorter, as it used to be before (I believe we had a month and half or two months?), I would understand the need for no minimum requirement. But with this longer time frame, one would expect something longer.
3. I believe someone brought this point up earlier in the thread, that these contests should be a way of challenging yourself and forcing you to step out of your comfort zone. If you're used to writing short pieces, this should force you to develop your music and expand your material. In the real world, you need to adapt to changes/requirements/constraints thrown at you...because life is unfair at times! If I start to make exceptions for everybody's issue with something, that would defeat the purpose of setting the rules and constraints in the first place...