Because in a bankruptcy stuff stops. Everyday processes get interrupted, and the administrator needs to tally up the balance sheet and sell off what they can to creditors.

It's not just some widget factory, it has connections all over the world but ofc also quite a lot in Switzerland itself. You don't really want one of your two biggest banks to cease trading.

With this tomorrow will be business-as-usual. Much more than in any other alternative, at least.