They deal with very specific constraints because of classroom economy.
If your stated goal is to get every child in this room to read, then you're wildly out of alignment with the needs of the child who could be reading the classics by the end of the year.
Gifted and accelerated programs only alleviate the problem by a fixed amount by adding one additional more intense tier, which every child competes for to improve their university application profile.
Any person who tried to teach a child one to one for a short period of time learns how unfit school is. The only limit to their learning is the adult's energy and skill. While school is the product of several rounds of the lowest slowest denominator.
Kings and princes used to be taught by tutors they form long term relationships with. This is still the best way. School is the equivalent of feeding the masses dog food to keep them compliant.