Dyslexia doesn’t need to be a life-long condition, it can be ended early for many more students than is currently happening, we have the neuro-science and the technology to do that.
Do not wait till grades 2 or 3 or later to see how a student progresses. Dyslexia should be treated as soon as a teacher or parent sees a student not picking up phonological awareness skills, this is typically noticed already in early grade 1.
Dyslexia and struggling reading, in the absence of other known factors that would account for it, are the same thing. A diagnosis of dyslexia isn’t necessarily needed to start treating struggling reading.
Dyslexia isn’t specifically about reversing letters or numbers