Not every project needs WordPress. Wix is a solid fit for simpler sites where the client wants to make small edits themselves without touching code, and I build those the same way I build everything else: clean, fast, and easy to actually use.
Wix is simpler to manage day to day if you don't need custom functionality or plugins. WordPress makes more sense once you need automation, custom features, or a store that will grow significantly.
Yes, that is a common migration path once a business outgrows what Wix can do.