Chinese culture places a high value on wisdom and the ability to convey deep meaning with brevity. 精辟 (jīngpì) embodies this ideal. It's a compliment that signals respect for someone's intellectual prowess and their mastery of a subject. A 精辟 comment is seen as the mark of a true expert who has gone beyond surface-level understanding. A useful Western comparison is the difference between a “thorough report” and a “pithy aphorism.” A thorough report is valued for its detail and evidence, but it can be long and dense. A pithy aphorism (like “The only thing we have to fear is fear itself”) is valued for its ability to capture a profound truth in just a few words. 精辟 leans heavily towards the latter. While a detailed analysis might be described as 深刻 (shēnkè, profound), only one that is also sharp and concise earns the high praise of 精辟 (jīngpì).
精辟 (jīngpì) is a formal and highly positive adjective. It's most commonly used in academic, professional, or intellectual contexts to praise a piece of communication. You would not use it to describe a person directly, but rather their words, ideas, or analysis.
It always carries a strong positive connotation and is a sign of genuine admiration for someone's intellect.