BC7 has a weakness: There’s only a single alpha mode that supports 2 subsets (mode 7). And it assumes alpha is correlated with RGB. The other alpha modes are only 1 subset modes, so they can’t handle complex RGB blocks well.
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Also, if your texture has decorrelated alpha, BC3 is stronger than you may think. BC3 has 5658 endpoints, while BC7 m4/5 have 5556 or 7776 endpoints.
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Some developers disable the mode 4/5 component rotation thing to avoid oddball artifacts with alpha textures, making these modes a little weaker.
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