I've been doing about 90% of my work on an iPad for a few years now.
I had a 128 GB iPad 4 and never used anywhere near that. My current iPad Air 2 is 64 GB and I'm using about 24 GB currently. (No video projects or downloaded media currently).
Regardless of the amount of storage on my iPad, I have transitioned to a cloud-based work life this past year. It simply became imperative to me that my documents and photos were synced and available to me everywhere. I don't know what a USB drive looks like any more. 😀
Everything I work on or with is either on DropBox, iCloud or my university's enterprise Box account, depending on the degree of security I need and how "sharable" I need it to be. My music is on iTunes Match/Apple Music.
My photos are a little different. My personal photos and images for teaching presentations are in Photos. My art documentation and creative photos are in Mylio, with originals stored on a hard drive linked to my laptop but with thumbnails on my iPhone, previews on my iPad and selected originals also available on my iPad.
I work on documents and then save them back to the various clouds and I stream my music, movies and TV shows (except for the rare times I go on vacation and decide to download a few things to my iPad).
I have a Verizon MiFi with unlimited data through my university and I take that with me when I travel and also use that as my home wireless router.
I do still have my laptop as a mother ship, with its external drives and multiple backups (to safeguard my professional images, to archive files until I finally jettison them, and to upload images from my old Sony Alpha. But, I could always upload directly to my iPad with the lightening-SD card adapter.)
After reading this over a few times I came to a conclusion. My 'guess' is.....
You Ma'am, are living the future of computing.
Like it or not, many of us on this forum (the minority compared to the masses) are rapidly becoming 'old school' in the way we've always done and think about computing.
I think the days of 'needing' terabytes of storage on your mobile device are fading as Cloud solutions become more developed and implemented. The pendulum is starting to swing the other way. No longer will it be how many Gigabytes of storage can I get crammed into a device but rather how little storage do I actually need anymore. 128Gb will seem like overkill in the future.
My Gen X niece is constantly on her mobile devices. She, and all her friends live in the mobile information highway. She won't even own anything that isn't mobile and has grown up living in the iOS environment. She came by one day and saw me with my MBP sitting on my lap and asked when I was getting an iPad. She said couldn't imagine owning such a 'heavy' and 'bulky' device (much less a desktop computer) and that none of her friends own anything other than a smart phone or tablet (most of them having an iPhone and iPad).
At first I was like, whatever, she doesn't know what she's talking about. Later, I realized she DOES know what she's talking about. Unlike me (I'm 56), she has practically grown up with a mobile device in her hands. She just 'naturally' talks more 'techy' then I ever did at her age. She knows the capabilities and functions of her computing devices far beyond what I currently know about mine.
As I've said before. The iPad Pro is poised to usher in the future to the rest of us. Today, it's just a way overpowered iPad with some new cool features, and unfortunately this early on that's all many can envision it to ever be. However, in the near future, when a maturing iOS and pro level apps in development catch up to and are able to exploit it's powerful hardware, the Pro true intent and place in the future of computing will become more and more apparent.
Just a hunch.