I think discussing language without philosophy is meaningless. What’s your opinion?
The purpose of ELL is not to "discuss language". We answer questions about English. Not just any questions though—practical, answerable questions. Philosophical questions are inherently unanswerable (in Stack Exchange terms), and are unsuitable for this format.
If you want to discuss philosophical questions, that belongs in one of the chat rooms, not on the Q&A pages.
I do not think this would add very much over and above the existing tag semantics on the main site which currently has 50 questions. Admittedly that tag does not have a wiki yet suggesting it is not a very clear tag either.