Good morning,
First of all, let me appreciate this wonderful write-up with well-balanced thoughts on the debate surrounding Valentine's Day. Like you said it has turned from its original intention of expressing either phileo or agape love to eros. In all of this, there are still people maintaining the purity aspect of it, and others feeding from the chaff.

Everything is subject to choice and what one can make out of it. While others are using to find love, others cease the day for reconciliation and the dirty part is possible, as many ladies sleep out, some got drunk, drugged, or to a large extent, died.

Back to your question, "Is Valentine's Day really Necessary"? My answer is no!