Humans are also "pattern recognition engines". That's why optical illusions and similar completely mess with our brains. There are patterns that we perceive as moving/rotating even though the pattern is completely stationary.
But nobody would claim that you can't trust your eyes in general just because optical illusions exist.
Try using the on screen keyboard with Firefox. On so many extensions the keyboard just doesn't work (concrete example: tampermonkey code editor). And it's not like it doesn't work at all - you can insert new characters but backspace and new line is broken.
Now try OSK on Windows - never had a single issue that it doesn't work where a real keyboard would have worked.