Smart meters and hackers

I searched and this came up:
https://www.sciencedaily.com/releases/2019/06/190606101822.htm

“Hacked meters can even cause house fires and explosions or even a widespread blackout. Unlike remote servers, smart meters can be relatively easily accessed by attackers, so each smart meter must be quite hackproof and resilient in the field.”

Security angles are hardly ever addressed with persistent targeting in mind. The same goes for locks on doors. But there is more beyond random brute force factors.