My workflow is also hindered by Apple not supporting keywords (or smart albums, or titles) in the iOS versions of Photos.
To work around this, I use my time on the road to add location data (as needed), write captions and create both ‘working’ and permanent albums. I’ll even process images if I have time — but not at the expense of the experience.
I do my keywording (admittedly less and less as searching becomes ‘smarter’) on the Mac when I get home. Using Houdah Photo Workbench I can batch apply a keyword set to every image in a ‘working’ album and, as albums don’t have to be forever, and an image can appear in multiple albums, I can create working albums for all the major keywords for that trip while on the road. (If there’s time. 😉)
Yes. I would like to create and use keywords, smart albums, and titles on mobile. Still, the benefits of the tablet outweigh the disadvantages. For me.
FWIW, you want to participate in the Adobe Support Forums generate calls for, and cast votes there for the features important to you. I have it directly from a source I trust at Adobe that those votes are tabulated, and the squeakiest wheels do get attention.