The new Mac mini is larger than the Apple TV by a bit—5×5 inches, instead of 3.66×3.66 inches—but its proportions are roughly similar. That makes its footprint significantly smaller than the old mini (and the current Studio), which was 7.75×7.75 inches, but it's also a fair bit taller.

One key spec has prevented me from picking up Apple's best-value Mac, but the new Mac Mini M4 has just fixed the problem

In theory, the refreshed Mac mini can be portable to the extent, that you could carry this puck-like computing device around, and connect it to another display or TV. The same cannot be said for a similarly powerful Intel or AMD or Qualcomm powered PC,