I think the OP has a point especially when you take into consideration how iCloud is incorporating photos, iWork and so on.
Who has < 5gb of photos?
And if I want 200 gb for £2.99 that's fine, but if my wife also wants 200gb she has to pay a further £2.99? So we're running at £6 for 400gb?
A terabyte of storage with Dropbox which I can share and collaborate files through costs about that.
I can't collaborate or centralise my library with iCloud.
Apple could easily clean this up:
Give 5gb PER DEVICE. It would go some way to helping users span their data.
Sort out family sharing. I want to share at the folder level, in iCloud and in applications. ie she doesn't have to fill up her iPhone with photos in iCloud from a large library on a laptop, and all of my photos of the kids can be seen from one library, hosted in my 200gb or whatever. And shared with my goddamed wife ffs! And, she can open a numbers document, from her iCloud account, edit it, and then save it in the same location so I can see the updates. You know? Collaboration.
The OP is right - more people should be shouting about this. Apple can't call a feature "family sharing" and then not let you share with your family!