Oh, I thought the physical CEs got delayed too.
As for the covenant abilities, I don't actually mind the idea of Shadowlands borrowed power only working in the Shadowlands, what I really dislike is the inconsistency. IMO if we're gonna have borrowed power only work in the new content, we shouldn't lose it at the end of the expansion. We should be able to use our Artifacts in Legion content, and our Essences/Azerite Armour in BfA content. They can make 'borrowed power' work more like 'prestige levels' for an expansion, curbing overwhelming stat increases over the course of an expansion by using expansion-specific power boosts that will always work in that content.
Not letting things work in older content while removing the ones that does effectively makes it harder or drastically slows our ability to solo old raids and dungeons, and I don't really like that idea.