For the particular example interoperability will make forks even more difficult as there will be even more “off chain” assets that can and will be intertwined together with DeFi.

On the converse side, a potential fork can prune out all the DeFi related components and then build bridges to the parent fork rather easily…but at that point should the child fork be really called a fork? And if this example was a contentious hard fork it is unlikely for one side to relent and not take the DeFi components.