No. The like button does not dilute signal clarity on Nostr. Likes are currently the purest form of signal on Nostr that expresses reach. Reach is different to value. A like is an acknowledgement that someone actually gave their time to me, which is far more important than their sats. In fact, I wish there was a more neutral way of expressing time given, of attention paid. Zaps are a great way of acknowledging value received. They are however blunt and one dimensional. Likes are small and subtle, a nod that you were noticed. I personally highly value likes as signal, especially as part of an ecosystem that includes zaps. ⚡️ 😀