It would be great to manage premium/paid plugin dependencies with Composer. There are ways to install other premium plugins like ACF Pro with composer and an .env var. Something like this would be amazing for managing WC plugins in modern development environments.
Bjørn Johansen commented
WooCommerce could setup a Composer repo using registered email address as username and license key as password, or let users create API keys in their account.
Other premium plugin authors like Yoast and Delicious Brains have setup composer repos, which makes it so much easier to use their plugins.