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That's DC power not AC needed to power homes, and even then only 2 minor junction points.

The power plants and substations are still needed to act as a giant DC-to-AC inverter. So if the plants are offline then the grid is effectively down, as it was in the Feb 2021 blizzard.

The DC is converted to AC after it crosses the bridge. The use of DC interconnects means the AC on the two grids doesn't have to be synchronized.

Does maintaining a system for political reasons remove the technical drawbacks?

We’re mostly engineers on this board, have you never had to build a substandard system to meet the political needs of a higher up and then watched it blow up in their face as reality doesn’t care about political needs?

Those interconnections are basically small scale arbitrage connections setup to take advantage of the difference in spot prices. They aren't close to the scale needed to make a dent in a power shortage.