I didn't get SWSH, but the fear of the eventual death of either the 3DS online support or of my old beaten 3DS made me sign up for one month.
I've been mostly using the mobile app instead of the Switch one, since I own zero Pokémon games on Switch.
First of all, man, the textures on the mobile app are fugly. Dracovish' legs almost look like a sprite instead of a model. Also, while the renders used for dex pages look gorgeous, the models themselves look absolutely dull. Compare Magnemite's render to its 3D model to see what I mean.
Second, I loved the introduction of labels. Allowed me to severly cut down how many boxes I had, facilitating the organization proccess. Only thing I don't like about it is that apparently there's no way of searching for only non-labeled Pokémon? Seems like a pretty big oversight.
I also wanna consolidate my findings about the Wonder Box. I tried filling half of it and one hour later the other half. Like clockwork, 6 hours after putting the first group in, only those first five were traded. I waited one more hour to get the remaining ones to be traded as well. So I'm pretty confident saying there's a 6 hours timer for getting a Pokémon in Wonder Box traded. Which is a ridiculous decision.
About Phione, I can confirm that even though Phione shows up when filtering off Legendaries and Mythicals, I'm not able to trade any of mine, and they were not event distributed, I hatched them from my Manaphy in Pearl, and they have no trade restricting Ribbons. So there's that.