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Does the toolchain on x86 still build an x86 and ARM executable(s)? Perhaps that contributes to the 2x build time?

For macOS universal binaries, yes, they still build both platforms. For iOS, it's only ever building for the platform you target, simulator or device, so the only change there is the simulator is now an arm64 target.

Typically in debug mode "Active Architecture Only" is set to "Yes." This means for most local builds you'll only have been building one architecture regardless of platform

This applies to incremental and clean builds running locally with default Xcode settings

When you archive and build for the store then your compilation will include all architectures

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