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.
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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