But I understand the reasons.
For clarity I can specify the reasons for warning about 'aspect-only' theories:
1. Students sometimes think that they must get a graduate degree in linguistics in order to properly learn Greek, because they don't quite understand the disagreements that they encounter on Greek aspect. I am a linguist, I approve of studying linguistics, but I do not believe for an iota of time that a person must be a linguist in order to learn a human language, and learn it well.
2. Students sometimes think that because the discussions keep continuing in NT Greek forums that there is reliable support for the aspect-only theory as a viable theory. Actually, that "support" is based on carefully picked starting hypotheses plus an echo-chamber effect (that has not adequately answered the three items listed, plus others). Students need to know that wide swaths of Greek scholars and linguists are unconvinced and even amused by the aspect-only phenomenon.
3. "Aspect-only" can easily becomes a diversion that blocks a student from fully learning Greek. After all, one may reason, how can I work at internalization of the language when I/they don't even know what the basic language is/should-be?
This last item is the most insidiuous, having negative effects on the field and the next generation. The next generation has the opportunity to be stronger with the tools and pedagogies now available, yet they will be weaker if students spend the majority of their time in secondary literature (literature about Greek) rather than primary literature (Greek texts themselves).
So I counter with sound-bytes, as the three items in the last post show, and as a reminder of the kinds of facts that refute aspect-only as a viable theory for the Greek verb. "Aspect-only" is properly framed as a historical anecdote in the field of NT studies and students should set a goal on a high-level of Greek competence generated from a wide acquaintance of Greek literature.
it is also true that Greek is one of the most highly aspectual languages in the world and aspect in Greek deserves continuing investigation (with the caveat that the time parameter is not deleted from the indicative). There are lots of interesting areas that could use more clarity.