The best response I could find is that Apple don’t have minimum hardware requirements for Xcode, rather they have a minimum OS requirement which has its own minimum hardware requirements. In terms of performance, I’ll just take a chance with 8GB as I’m new to this. If after 6 months things are going well, I can always upgrade. Perhaps making a side-by-side video of 8GB vs 16GB would be helpful for others starting out or planning an upgrade.