What is your workflow? I use LR Mobile all the time. Then I go back to my laptop to export them to jpegs.
I'm wondering what LR does when it sync's smart previews and you try to export those. I know when I try to zoom in on a smart preview, the detail isn't there. But if I use the SD card reader and import the files to my iPad, the RAW files are there and it says "Original", I can zoom in till my heart's content and it stays sharp.
I've been testing the waters of eliminating my laptop from my workflow, but I can't seem to quite get there. Getting closer and closer though.
Ive been using just my iPad pro with LRM more and more. Its also caused me to make the SD card my main card, as its easie rot get the files on to my ipad.
Ive almost eliminated my desktop LR but there are still reasons to use it. The lack of using Camera profiles is the biggest issue i still have. Adobe Camera profile is ok sometimes but i find the images lack a bit of punch.
There are also export issues. If you chose to export at the largest size you will always end up with the same dimensions, even if you have cropped in heavily. This results in a softer image than you would expect. Its a shame these two issues are there, as LRM has come on in leaps and bounds recently (unless you use speed rating a lot).