This would solve the following issue which we constantly face - we have a private in memory cache with gigs of data on a role and we have web and woker roles that share codebase so these two need to be upgrade together. The cache role code never changes however if we want to upgrade in place, the cache roles are forced to be upgraded which essentially means they're rebooted and as a result unnecessarily loses the cache data, which means we then have to re-hydrate the cache which takes time. If we could skip the cache role upgrade, the cache data would not need re hydrating.