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I've already informed (and as such, disappointed) the wife that there will be a Homepod and new Apple TV coming into the house by the end of the year.

I felt doing it now would give her time to process and then accept that it's happening.
You should just buy them and then let get deal with them. That's the strategy that works best with my husband. If you tell him in advance he moans and says I don't need it and moans about how much it costs. If I tell him after the fact he just rolls his eyes and gets over it.
 
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