froob:billgates:...
You only need the storage card for new gen games. You can play and load all BC games from USB 3.1 external HDD.
And in fact, it looks like a decent SATA or NVMe SSD hooked up by USB3 will load last gen games basically the same speed as the internal SSD does: https://www.youtube.com/watch?v=7y-Fy1Q2O2k
I'd save even more money and just stick with a SATA SSD in a usb enclosure for old gen games. There was a couple of seconds in it and you'll get more storage for your money going that way, an nvme drive seems overkill as it will be held back by the usb ports. In the first few months that will be more than enough to tide you over until the cards get some competition in the market that is supposedly coming later.
Also worth knowing quick resume will work on games installed to the usb drive too, seems the suspend state saves to the nvme drive no matter where it came from. Handy if you are playing off even a mechanical usb drive