While “下个” itself doesn't carry deep philosophical weight, its structure reveals a key aspect of the Chinese worldview: the use of spatial concepts to describe time. The characters for “up/above” (上, shàng) and “down/below” (下, xià) are used to mean “last/previous” and “next,” respectively.
This can be conceptualized as reading a vertical calendar where you move “down” into the future. This contrasts with the English concept of “last” and “next,” which are purely temporal and don't have a common spatial equivalent. For a learner, mastering the “上/下/这” (shàng/xià/zhè) pattern with time words is a major step toward sounding natural. This structure provides a logical, systematic way to navigate time that is central to daily communication.
“下个” is used constantly in informal, everyday situations. It's the standard, default way to say “next.”
Its connotation is neutral and its formality is low. It's perfect for daily conversation with friends, family, and in service situations.