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I'm not sure how true this is. There are DC ties that allow Texas to import from both the East and West interconnection, but power is scarce everywhere now. So even if their region was fully AC connected, all the other nearby regions were scrapping the bottom of the barrel as well.

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But the lines have a fixed capacity, and only Texas is having California-style rolling blackouts.

The West is having crazy snow too, so I assume it is just as bad. Just east of ERCOT is SPP which was also in an EEA3 and very low on capacity. Northeast of them is MISO which is also in an EEA3 event (ready to curtail load) and very low on capacity. So even if they weren't as islanded, they'd still be in a lot of trouble. Both SPP & MISO have also curtailed load which is always the last resort. This thread is focused on the Texas grid being isolated as a primary cause, when natural gas supply and low wind are much bigger problems to me.

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