Screens with narrow viewing angles

Screens with wide viewing angles

Privacy filters

Why do I bother buying a screen with wide viewing angle then paste a privacy filter over it? Shouldn't I just get a screen with narrow viewing angle?

Because there are people with different needs. People who need wide viewing angles, people who need privacy.

And the market isn't big enough for both, so the smaller one becomes an add-on.

Following this argument, "warm-sound" add-ons are there because people want them to be.

And capacitors that redefine physics.