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California is part of the WECC, it is not isolated at all.

The Southwest region is certainly geographically isolated; however California is doing its best to fight that with connections such as with the PNW, but those are long distance and California is still susceptible to power outages from a few weak links .

“California currently has 18,170MW (18.2 GW) of interconnections to neighboring states in the Western Interconnection, equivalent to approximately one-third of its annual peak electricity demand.“

In my view, 33% of annual peak is not weakly interconnected. Granted that number is from 2003.

I work on hydro electric plant control systems not transmission planning so I can’t say what industry insiders would call weakly interconnected, but on the systems I have worked on one or two ties is weakly interconnected and dozens is not.

https://www.electricpowergroup.com/Downloads/pFinalCAElecGen...

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