I've now played with a Raspberry Pi 400 for a week and here are my conclusions
I understand why the Raspberry Pi uses SD cards (cost, simplicity, ease of use) but the entire line would be so much more useful with onboard eMMC storage.SD cards are great for keeping cost down and getting started quickly by flashing OS images from a PC. However, enthusiasts spend so much time fiddling with external storage options and cobbling together messes of powered USB hubs, cables, external enclosures, and fiddling with kernel issues (USB attached SCSI) that a Raspberry Pi with built-in eMMC would be a breath of fresh air.They could even keep costs down by adding a connector for an eMMC submodule, similar to what ODROID has done with their boards.