Sorry for the misunderstanding but I didn't say about my fish being put into a hospital tank. I was talking more generally like taking a fish from a 65gallon to a 10 or 20 gallon hospital tank.
And from your post, I think you are not very fond of nanos
There are people, like me, who doesn't have the provision of keeping big tanks (in terms of money and space) and hence nanos are there and they are no big of a difference other than the limited stocking list.
And please don't attack me with the "money" thing because I once had someone attack me with "if you can't get a $50 refractometer, you are in the wrong hobby" because I believe there's more into this hobby than just money and that is dedication. BTW I do have a refrac now :P