Not from the perspective of collection, no.
Suppose Joe crashes into your car, because he was driving fast and his brakes failed. You sue Joe, and the Auto Shop that recently fixed his brakes, and Ford because the brake parts the Auto Shop installed may have been defective. The court finds all three were liable, awards you damages of $100,000, and rules that they were jointly and severally liable. The Court allocates liability at 50% Joe, 30% the Auto Shop, and 20% Ford.
So what do you do to collect? You go for the deep pockets and enforce the judgment for $100,000 from Ford. Because the three defendants are jointly liable to you, that allocation of liability doesn’t apply to you. Ford has to pay you 100% of the award. You’re made whole.
Then, because Ford is severally liable with the other two, Ford can go after Joe for $50,000, and Auto Shop for $20,000. But if Joe doesn’t have proper insurance and not much assets, Ford may not get anything and has to eat the $50,000 it’s paid on Joe’s behalf. Probably will have better luck getting $30,000 from Auto Shop’s insurance.
If the Court only ordered several liability, you would have had to go after Joe for $50,000, Auto Shop for $30,000, and Ford for $20,000.
If it were purely joint liability, if Ford pays the whole amount, there may not be any right of recovery from the other two, depending on the legal concept of joint liability in your jurisdiction.