Honestly, it doesn't make sense that you felt the iPad Pro 10.5 in portrait was small and the text not legible compared to the Fire (both smaller display and lower pixel density). Even with margins cropped on the Fire, PDF displayed on the browser should still be bigger and the built-in PDF renderer should display them quite adequately.
I think your frustration and lack of familiarity with the software might have colored your perception when it came to actual PDF rendering abilities.
Mind, iBooks should've been pre-installed on shop models and it can definitely display PDFs in fullscreen paged mode.
For reference (dimensions calculated from diagonal size and aspect ratio):
Letter
8.5" x 11"
Pro 12.9
7.8" x 10.3"
Pro 10.5
6.3" x 8.4"
iPad 9.7
5.8" x 7.8"
Android 10.1" 1920x1200
5.4" x 8.6"
Android 8.0" 1920x1200
4.2" x 6.8"
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