Yeah, it's preferable that Sony go for proprietary storage expansion because it will have the same speed as the native SSD, even if it means being salty. People don't have good memories for Sony proprietary stuff. But it's way better than allowing USB external hard drive and keep transferring files between it and the SSD.
Sony is also allowing transferring files between the blu-ray disc and the SSD.
Sony is also allowing transferring files between the internet and the SSD.
So why would it be bad allowing to transfer files between an external HDD or "slow" SSD and the internal SSD? Especially if they make that transfer fully automatic in the background.
F.e. 100 GB of the internal 1TB SSD could be reserved for the currently played game. Or 500 GB of the internal 1TB SSD could be reserved for the last played 3 - 10 games, on the other part you can "pin" your favorite games you constantly want on the SSD. If you start a game stored on the external drive, it will be copied within minutes to that area; much faster than a reinstall from the blu-ray or a redownload from the internet. Perhaps the game could start instantly from HDD to the main menu and while you are still chosing the game mode or watching the intro, the rest of the game is already copied to the internal SSD.Last edited by Conina - on 16 November 2019