Heads-up: OpenBSD does not yet support power-saving on anything Arm64. The CPU will be running at full throttle the entire time, which will be a showstopper in some cases.
Not true, CPU frequency scaling (apmd, cpu.setperf/perfpolicy) is supported on many ARM machines, including the ThinkPad X13s, Apple M1/M2 Silicon, Raspberry Pi 4 (but may depend on whether using EDK2 or U-Boot firmware).
Support for Snapdragon X Elite machines was added as recently as last month, even..
