It's because the whole app ecosystem is proprietary and the open source packages aren't as polished. I remember when it was a huge pain to use Bonjour. It seem

It's because the whole app ecosystem is proprietary and the open source packages aren't as polished. I remember when it was a huge pain to use Bonjour. It seems like this should be a solved problem but maybe it takes a Mozilla or some other larger entity to push the marketing and the customer support and development to really solve the problem of transferring large files securely.