Why is Shehecheyanu generally not recited today upon seeing a friend after a long absence?

A source-based Torah discussion of the question: Why is Shehecheyanu generally not recited today upon seeing a friend after a long absence? This localized discovery layer presents the canonical issue for search and study without adding a new practical ruling. The author-fidelity publication clearance is preserved, while the full Hebrew source remains the controlling text for its reasoning, qualifications and conclusion.