Pleasure! It works very well for me. Once I’m done with a certain project, I then clean up these ‘To Read’ folders, remove tags and replicants, and move on to the next thing so repopulate them with new files.
Your mileage may vary on the Files/PDF Expert integration (though it’s really getting in my way of late and it’s super irritating that my PDFs are there one day, and not the next (see Files app can’t load contents from DTTG). I’m almost tempted to get a newer iPad!