Another reason is, all extra dependent hypothesis will be explored equally at an earlier stage of a research topic. In brief, most trash papers compete each other at the earlier stage and only after some time, a dominate theory/​model will be established. The competition process actually is very similar as the process of virus evolution. At the earlier stage, there is no reason to assume a dominate new model yet. Thus, no heterogenous should be assumed.
Another reason is, all extra dependent hypothesis will be explored equally at an earlier stage of a research topic. In brief, most trash papers compete each other at the earlier stage and only after some time, a dominate theory/​model will be established. The competition process actually is very similar as the process of virus evolution. At the earlier stage, there is no reason to assume a dominate new model yet. Thus, no heterogenous should be assumed.