There are equivalents in smartphones. MIPI standards like D-PHY and C-PHY and DSI and CSI on top of those ensure compatibility of cameras and displays in a way

There are equivalents in smartphones. MIPI standards like D-PHY and C-PHY and DSI and CSI on top of those ensure compatibility of cameras and displays in a way there is significant competition among suppliers there, and wide range of options for handset makers. JEDEC similarly does so for DRAM and Flash. Unlike the IBM PC era, the mechanical interfaces aren't standardized due to the desire for deeper physical integration for miniaturization, but the electrical interfaces and protocols still are.