I read the thread. This makes a lot of sense: Since you jump with your main a lot, you want something that is relatively easy to use and reliable at the same time. Body position shouldn't be an issue, since, if you're off student status, you should be deploying stably, and if you are a student, someone should be making sure you're deploying stably. For a reserve, the extra care necessary to properly pack the spring-loaded PC is not as big a deal, since you're not expected to use it as often.
I think that summarizes the thread. Makes sense. Thanks for pointing it out.