Three fundamental hallmarks of philosophical works

According to Napoleon Mabaquiao Jr., in the strict use of the word philosophy in the academe (strict use of philosophy), there are three fundamental hallmarks of philosophical works:

1. Topic: a philosophical work asks questions about foundations
2. Methodology: a philosophical work uses methods from philosophical traditions
3. Arguments: a philosophical work uses argumentation to advance ideas

However, I think these three fundamental hallmarks of philosophical works are restricting.

References

Mabaquiao, N. (2011). Isang Paglilinaw sa Kahulugan at Kairalan ng Pilosopiyang Filipino = A Clarification in the Existence and Meaning of Filipino Philosophy. Malay, 23(2), 39–56.