I feel like the way to go there would have been closer to the Meta/Facebook brand hierarchy.
X is the platform / super app and Twitter is the first app within X. Twitter accounts become X accounts but you still use them to Tweet on Twitter.
The destruction of the Twitter branding seems more out of spite than business development goals. Really the whole follow through of the Twitter purchase reeks of spite and destruction rather than building something new of value.
But I'm not a successful billionaire so I'm probably wrong.