Why do almost all HD44780-based LCD displays use font pattern A00
Economy of scale.

Buy 100,000 chips that will do for all displays at say $0.10 each, or buy 50,000 of one chip at, say, $0.15 and 50,000 of another chip at $0.15 each.

(figures purely fictional - for illustration only)

You do the maths.

While it's not 100% perfect for every display, it does mean that they are cheaper, which is good for all of us.