** V E R S I O N 1.1 **
10 years ago what was missing from Lr that we now have?
If your point is this never existed natively before you are correct except there are automated workarounds/plugins for desktop versions of light room (lightroom-google-photo-plugin/README.md at master · stanaka/lightroom-google-photo-plugin · GitHub).
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No, the point is that the "new" Lightroom CC is a new approach, a new Lightroom, going in a new direction, targeting a new audience. It is NOT a replacement or an upgrade. It will change and evolve and new features will eventually become part of Lightroom CC as the program matures. Nothing has been "taken away" from Lightroom CC because (as I indicated) it is an entirely new program. What you see in the program now is what has been provided SO FAR. The only thing to remember is that patience is a virtue. If you want all the features that have been legendary in Lightroom for nearly a decade than Lightroom Classic CC is probably the program of choice. No, it hasn't been replaced. Lightroom Classic CC is still alive, still being supported and updated if you want to go that way. YOU need to decide which program best meets your needs.
Slideshows are built into the Lr CC mobile apps e.g. on phone or tablet but not currently in Lr CC on the desktop. It is possible to view slideshows from your Lr CC Web App and if you have a smart TV with browser that could be one option for viewing your images. Log-in at the link below.