"Lightroom is surprisingly useful [...] on an iPad. You can do 95%+ of what you need on it."
If all you process are your snapshots, sure. Otherwise, it's just bullshit.
You can't color calibrate the iPad display (and it may not show all the colors a wide gamut monitor can) The screen is too small, especially for comparing two photos (see the new "reference view" function). Image zoom is limited.
LR mobile pre-CC for a while even didn't have sharpening tools (!!!!), later added very basic ones (sharpness/noise only). Sharpening is one of the most important steps in digital photography, especially when you process RAW files which weren't processed by the camera at all.
But the iPad Pro, you can't use a proper per for local adjustments. Plugins won't be available, nor you can make round trips to Photoshop or tools like Helicon Focus (focus stacking). No panoramic images, AFAIK (I use Hugin). No virtual copies (very useful for different processing, i.e B/W, and of course, soft proofing for printing), and very limited export formats.
The collection feature in LR mobile has a fraction of the capabilities of a LR catalog (when you have an archive of 30+ years of photos, scanned or digital, it matters). You can't fully tag and add IPTC data, nor you can apply presets on import.
Nor you can print (I do print my photos up to A3+ myself, and even larger one using a print shop). If the photos aren't processed correctly, any defect will be clearly visible at those sizes.
Actually, the new Lightroom CC sends all your photo automatically to the cloud (you may have a partial or full copy locally - but not on NAS, unless you link it as a subdirectory of your main drive).
So, sure, if what you use and need is 25% of the Lightroom features, the mobile version will cover 95% of your needs. Unluckily, if you use 95% of the Lightroom features, the mobile app will cover 25% of your needs only...