I use it alongside.
Eventually with bridges that are surely coming or with their PDS self-hosting architecture, I'll just post using my own infrastructure as I do with ActivityPub and Hubzilla/Friendica/Wordpress now.
We can have more than one place, as long as its still decentralized-- And the only central place within a unified Fediverse should be your own little space within, whether it's an asteroid or a whole galaxy.