You are not connected to a grid, by having electrodes measure potential differences in your brain. If the chip (outside of your brain) were to malfunction, then the interface would simply no longer work. big deal. you replace it.

Again, wtf do you think a brain inplant is?

Not how a brain implant works.

If I could have direct interface to my devices (write text by thinking it, control video game characters,…) I would get one in a heartbeat.

Sadly it’ll be a while until the tech comes that far and it’ll have strictly medical usecases for quite some time.