The biggest fun of an expansion is always the discovery- everyone trying the new civs, and trying to figure out what works and what doesn’t.
With many top players/content creators having months to test out and refine their build orders on the new civs, and creating guides for these build orders, we’ll almost certainly see a meta on day one as people simply copy their favorite content creators.
This kills all of the fun, because instead of a meta developing organically, it’s already going to be settled on day one. If you try to experiment, you’ll be destroyed by players following build orders that have been tried and tested by top players for months.
That’s why I’m suggesting a 1 week embargo on streams/build order guides post expansion launch.
Content creators would still be able to put out generic guides explaining what the civ units and buildings do, but not provide detailed guides on the “right” way to play them. Streams would be embargoed so that people don’t just watch pros and copy what they do. This way the expansion is actually interesting instead of just a stale meta from day 1.