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As the distance from the emitter to the screen decreases, you start to get skew on the beam. Think of standing a ways off from a wall and shining a torch on it - you get a spot of light wherever you shine. Now stand right up against the wall and shine the torch around - it starts to deform from a spot to an oval/parabola. Then of course the shape of containing vacuum 'tube' gets thinner which is a less than ideal shape to contain the vacuum.
For the years the CRTs were a tech, there was incredible interest in making them smaller and lighter, but they found nothing. The only future tech could be something producing advanced beam forming that could control the shape in realtime (not outside the realm of possibility) but you still have the issue with the physical requirements. You would never get thin displays. Maybe an 80" would be something like a foot/30cms deep and weigh 50+ kgs. Power draw would probably be mammoth.
CRT powered front projection has always been the best, you’d need to be running a small coke empire to have it at your house but when you had light controlled rooms it was superior to anything. It doesn’t count as a tv, but basically a tv is a smaller cheap miniature version of a screen with great image quality