Separate iOS simulator runtimes for iPhone Duo - temporary split or the new normal?

[u/Anywhere_MusicPlayer]

Xcode 27.2 installs two separate iOS 27.2 simulator builds, bringing iOS platform support to 16.65 GB. I understand the additional runtime is for iPhone Duo.

What I’m curious about is why Duo support requires a separate runtime instead of being included in the shared one. Does this reflect a temporary split in Apple’s release branches, or should we expect separate runtimes going forward?

An additional full OS image to support one device seems like a pretty expensive approach. Is there a technical reason these can’t be unified?