A is already considered very large; for example, the capacitance of the Earth's ionosphere relative to the ground is estimated to be only about 1 F.

To create a standard parallel-plate capacitor of would require physical dimensions far exceeding anything achievable on Earth.

Because it is such an enormous value, it was never practical for standard electrical applications and remains a historical curiosity. For perspective:

Outline a of why these extreme units were originally proposed. Abfarad - Definition, Meaning & Synonyms - Vocabulary.com