If you redeploy to Tenant and that tenant is deemed to have the latest version, then the tenant is skipped.

Though the main reason (well for us and many other companies I've worked at using Octopus) is that we simply want to re-apply an updated variable set.

In this scenario:
* I don't want to redeploy the package.
* I only want to re-run the web.config/appsetting.json transforms.

Install of just the skip option
(x) Skip deploy...
( ) Apply configuration changes only