Learning disabilities are a type of neurodevelopmental disorder in which a student that is of otherwise average of above average intelligence struggle with a specific type of material, commonly reading (dyslexia) or basic math (dyscalculia). The most effective treatment is early remediation, in which students in primary education are identified and given extra lessons and exercises on their weakness to help make them more well rounded so they do not struggle later in their education. This is super effective.
I can tell your frustrated with accommodations. I think your arguments against accommodations would be a lot stronger if you knew more about them. I think you might have some good points inside, but your frustration and ignorance prevent them from being compelling. I encourage you to do more reading, but let me point out a few mistakes in your post.
* You seem to mistakenly associate a learning disability with low intelligence. A person cannot have a learning disability and be below average in intelligence by definition. Struggling to learn how to read while being average or above average in every other subject is different than strugglingly to learn everything. The more a student struggles to learn to read while excelling at everything else, the more likely they are to be diagnosed. This means very intelligent students with a learning disability are more likely to be diagnosed than average students with the same disability.
* Extra time on test is an accommodation.
* Accommodations are not being handed out like candy for no reason. Anyone can buy candy. Accommodations require a documented disability.
* Many standardized test accommodations are very appropriate, such as blind people being offered a braille version of the test, or people with poor motor control having someone else physically fill in scantron bubbles.
* A student can be disabled based on low intelligence. It's not called a learning disability, because it's fundamentally a different thing.