I could add a single word to the ISC license in order to make it incompatible with every license in existence including itself (to an extent). You can not measure scope or complexity by counting words.
The problem with the "El Capitan License" is not the length but from vague phrases, unlimited scope, and inconsistency. It declare third-party agreements that doesn't exist in the document. It tries to limit fair-use, even if the law do not allow copyright licenses to do this. It tries to be both a sold product, a rented product, and a borrowed product. It try to limit commercial use for a product intended for commercial use.
The problem with the "El Capitan License" is not the length but from vague phrases, unlimited scope, and inconsistency. It declare third-party agreements that doesn't exist in the document. It tries to limit fair-use, even if the law do not allow copyright licenses to do this. It tries to be both a sold product, a rented product, and a borrowed product. It try to limit commercial use for a product intended for commercial use.