So, what are tablets actually good for ?
Tablets are great for *consuming* digital content. Such as for sitting on the couch and watching some film, or showing family pictures at tea time. There is certainly a market for this, but it is near saturation in the developed countries.
A couple of years ago when this tablet trend started, many tourists would run around in sightseeing places actually blocking their view by big devices with an Apple logo on it, which they abused for taking pictures. Not a very clever idea, this caused some avoidable accidents and also at that time there were already smaller, better and cheaper alternatives around (so-called "cameras"). But at least it served the purpose of demonstrating that its owner had enough funding or credit limit to buy such a gadget.
But when creating or editing digital content, having a keyboard and a mouse (or similar pointing device) makes a big difference ...