[ohaideredevs]

1. You may want to choose a less intellectually rigorous career if your IQ is low. Or you might get an early warning to work on factors you can control - for example the ability to focus, getting enough sleep, etc.

2. "With enough time..." is a totally irrelevant argument made by people who don't understand competition and how it applies to the real world, as in for scholarships, promotions, etc. Time is everything - and its a luxury. It also cuts into your free time heavily.

3. This is true. Except, when you read some code or a complex math concept, have fun if your working memory is sub-par and you can't even remember what the inputs to a function are.

"Its only important/useful subject for a select few people."

It's the exact opposite of that - it is applied to learning any field fast.