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> Apple uses correct grammar.

“2x as bright” or “twice as bright” is correct. “2x brighter” is not the same. Apple uses both.

People reading along should ask themselves: How bright is 1x brighter?

IMO, the 'x' changes it. 1x is 1 x the other number, x meaning multiplication.

1x brighter is an oxymoron, it cannot be 1x as bright and also be described as brighter. 1x as bright means same brightness.

#x implies multiplication (from the mathematical notation of multiplication, ×, which looks like the letter X). 1×a = a.