That's very useful info for the future, thank you. Yet another infuriating decision by lenovo. I wonder what the reason could be.

These days power bricks are not external power sources anymore but merely charging devices.

CPU spikes can create power draws that could not be handled by power bricks as the system is designed as a whole, including a working battery to absorb such spikes, allowing for a downsized power brick (cheaper, simpler, smaller).

Gimping the CPU allows the machine to reliably operate in absence of battery, otherwise CPU spikes would result in power loss.

Also very useful info, now I'm way less infuriated. Thanks!

Which some ACPI tables on EC editing might fix.

EC editing is how the Fn keys of traditional keyboards from the xx20 series transplanted into the xx30 series are made to work