1. Analog technologies continue to be popular the deeper we travel into digital integration. It explains the continued fascination for - and emotional attachment to - physical objects. They deliver beauty, intrigue and old-school ingenuity. They carry in them long tradition, which engenders both curiosity in and respect for the past. People *need* such feelings of attachment, few if any of which can be obtained by current retail technologies and interactions. Quite apart from being obsolete/redundant/useless, mechanical watches are absolutely essential because we can hold and admire them, and grow memories with them.
2. The moon phase complication is one of the most powerful embodiments of how human beings have learnt to experience and understand the passage for time. Its movement and phases have literally shaped humanity and our own rhythms. It's one half of the sun-moon duopoly that allowed us to organise ourselves and our communities. It allowed us to observe and understand the passage of months, and to segment the passage of seasons. Many people living in urban environments (i.e. most of humanity now) can't "just look up" and see the moon unimpeded. They're disconnected and have no grasp of how utterly mesmerising it and moonlight can be. Even if only symbolically, moon phase watches connect us to an intimate relationship between the sky above and the earth below that has shaped us for tens of millennia. If that's not useful, what is?