How does that work? If you run selinux without a policy, you also get no type transitions and no file labels. That means that after a week, you only have a list of things your system does, with every action coupled to the init_t domain (or possibly even kernel_t), and file access targeted at unlabeled_t (unmanaged_t?).

At the bare minimum, you need a base policy that already contains separate type contexts for each of your services, file contexts to apply to the service daemon binaries, and type transitions so that each service gets run in its proper context. If your daemons run in the wrong context, then immortalizing that in policy with e.g. audit2allow only deepens the swamp you're in.

I don't think there's any practical way to build an selinux policy from scratch by just running your system and recording it, even if the tools allow you to do that. You can only start from your OS' reference policy or indeed write the initial base policy by hand.