Sure, we all know the historical connotations, but we also all know the actual definition of the word. Though I will say, given the correlation between educational resources and race, the historical connotation may be appropriate in some of these gifted vs non gifted situations.
Because we know it can be done and how to do it.
Have different classes at different speeds.
We already have that. Education is more than a series of classes. It's the social interactions too.
However, to say that segregation of kids should be the norm is a dangerous. IMO reckless.
I find it dangerous, reckless and disingenuous for you to use a loaded term like "segregation".