It took a while to nut it out but when I stop to think about it, Adobe's direction with Lightroom is both loud and clear.
First, while Adobe has been posting news about ever increasing profits from its business model change to subscriptions, there is no information available about what the individual product takeup has been. It is therefore quite plausible that (say) Photoshop and other products have been leading the charge but others (such as Lightroom) are either stagnant or falling.
Who are the predominant users of Lightroom? Photographers with dedicated cameras, typically interchangeable lens cameras. The sales figures for ILCs has been in constant decline for a number of years, therefore betting the future of a product (such as Lightroom) on the future of a shrinking market segment seems rather foolish if you adopt a long vision. This is why I believe Adobe have created "Lightroom Classic" - it is a reflection of what will become a classical way of taking a photo (using a dedicated camera). It is also a reflection of what level of growth Adobe foresee in that segment of the market.
To stay relevant to the hundreds of millions, if not billions, of cameras in mobile phones, Adobe needs a new product to sell to people to help them manage and publish images. That product is Adobe Lightroom CC. I do not see this application as one that targets users of ILCs as the raw files, not to mention method of photography are inappropriate for cloud. Yes, there are some romantic notions around Lightroom cloud for sharing but I cannot see this as being the raison d'etre for that product.
From other comments that I've read on the 'net, it would seem to me that Adobe is trying to get itself into the publishing path on phones. This would mean that your workflow would be the following: use your phone's camera to take an image, edit in Lightroom, publish to instagram/facebook. If I fast forward to far enough in the future, after taking an image with my phone's camera, I then use Lightroom to tag it before sharing with co-workers or family that are also connected to the cloud. How does a reporter on the street get an image that they just snapped with their phone back to the editing desk and in front of the right eyes quickly? Using Adobe Lightroom CC.
It may not be a thought to cherish very highly but my take on "Lightroom Classic" is that in Adobe's eyes, the place of the "traditional" camera is fading quickly from our lives. Professionals will continue to use them but the average Joe on the street? I don't see this move by Adobe as them backing John Smith continuing to own (or desire) a dedicated camera of any description.