These are sound technical reasons, and it would have been amazing if Apple had done it earlier, before being difficult.
However, the whole point of the here and now is to remedy the fact that Apple is in the "abusive gatekeeper" position. While they're both the platform and the competition, I don't think their proposal is a valid remedy.
One viable alternative (short of Apple divesting/spinning of Safari) is to delegate review of 3rd party browsers to an independent 3rd party. There may be others.
However, the whole point of the here and now is to remedy the fact that Apple is in the "abusive gatekeeper" position. While they're both the platform and the competition, I don't think their proposal is a valid remedy.
One viable alternative (short of Apple divesting/spinning of Safari) is to delegate review of 3rd party browsers to an independent 3rd party. There may be others.