(I) "Ability to carry out correct process"?
...or (II) "students understand the Meanings"?
Pragmatic reasons: lack of "carry-over"
A major hurdle : habits and beliefs of students
Mathematics "is":
In College Algebra especially. We're FOILed
by Mathematics seen as
Memorized Mechanical Manipulation (M3)
of symbols.
Student performs FOIL on (a+b)(c+d) = ...
Same Student tells us that (a+b)2 = a2 + b2