It's not for stability reasons.Just saw this:
Intel Core Ultra CPUs May Feature Lower Clock Speeds to Avoid Stability Issues
Arrow Lake-S, Intel's upcoming generation of "Core Ultra" desktop CPUs, may serve as a new challenge for Intel's marketing department, according to new rumors shared on China's Weibo forums recently that suggest the new flagship, the Core Ultra 9 285K, will launch with lower clock speeds to...www.thefpsreview.com