That doesn't really explain anything. CA is also a high tax state. CT has similar climate and geography to MA, which was once a technology leader but later fell behind. There must be other, more important differentiating factors.
California has a Mediterranean climate with world class outdoor features and the freshest foods. They also ban all non competes, and have a solid history of pumping out valuable tech companies. They can afford to have taxes others can’t.
Connecticut also lacks a big city with a big airport.
