There is always an endless stream of vulnerabilities for every piece of tech you use: software, OS, router, etc. This fact is not a good reason to embrace security nihilism, for consumer devices, routers, or servers. When any vulnerability is found, it should be remediated within reason (likelihood of exploitation, severity of exploit) and life should go on until the next one is found. That's one of the persistent costs of using technology.

School teachers able to determine which students have been using their phones in class by looking at battery charge before and after.

"Zero trust security model" https://en.wikipedia.org/wiki/Zero_trust_security_model :

> The main concept behind zero trust is that devices should not be trusted by default, even if they are connected to a managed corporate network such as the corporate LAN and even if they were previously verified.