The day apple gets its Files app right, I would be able to use iPad as my emergency laptop replacement. Sadly, the File management is the biggest bottleneck on the iOS to be a good replacement of a laptop. Also, iCloud storage while fully baked in but still not the best cloud storage solution. Having just a simple way to mark a folder for offline storage and background sync across all devices will be a great addition. There are workarounds but not as seamless it should be.