Just to be clear I’m not recommending that untrained individuals work on the battery pack. I don’t think Tesla even allows certified shops to do that. Often when an accident is bad enough to damage the pack the car is totaled anyway.On EV specifically? Maybe, maybe not. But on high voltage battery systems, yes absolutely. The standards for how to protect yourself and which PPE to use has been discovered over decades of deaths and injuries. Massive DC power buses and DC battery banks in datacenters have led to fatalities, and those battery banks can be smaller than 75 or 100 kWh.
This is why interlock devices and tag in / tag out exist. People make mistakes all the time, they think they de-energized a system, and they're severely injured or dead an instant later.