What is "weird" about uMatrix, specifically? The logic of the matrix is completely straightforward, once you get the basic rule that narrower rules override br

What is "weird" about uMatrix, specifically? The logic of the matrix is completely straightforward, once you get the basic rule that narrower rules override broader ones, all interactions with the matrix will become obvious, easy to understand in advance what will happens when adding/removing a specific rule -- and in any case, the visual feedback when adding/removing a rule through the popup panel matrix should be obvious enough to understand what will end up blocked/allowed.