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Dropping it was a real regression: many published ESP8266 configs pin board_build.f_cpu: 160000000L for timing-sensitive integrations (MHI-AC-Ctrl documents the 160 MHz requirement in its example), and the warn-and-drop left those devices at 80 MHz. The option now routes into CORE.platformio_options under toolchain: arduino for the generator to consume; other native toolchains keep the warning.