That's a thoughtful take, and I agree that the Knight of Cups deserves more nuance than just "romantic hero" or "charming trickster."
For me he’s about emotional pursuit — not just romance but art, spirituality, a dream, whatever someone’s chasing with feeling. He moves with intention, led by emotion and vision. Charm is part of it, but not necessarily deceptive; it usually shows someone who’s really tuned into their emotional or creative side.
Context matters though. In a love spread he could show a romantic gesture, an emotionally open person, or the start of a sincere connection. In a shadow position he can point to escapism, overidealizing someone, or chasing a fantasy without enough grounding.
So no, not purely romantic. I see the Knight chasing beauty, meaning, and connection — which can be inspiring or a little unrealistic depending on the reading. Do you find your interpretation shifts when he’s reversed or surrounded by certain cards?