Learn English – Does “in” mean “after” in “The passport will expire in 2 years”

Don't think of it as an extra "for"; "provide for" in this sentence is shorthand for provide an opportunity for. A better replacement would be allow.

"Interviews... allow an assessment of motivation..."

The will in can and will is not the epistemic ("predicted/expected future") will, but rather the deontic ("be willing to") will, the one that shows up in hypothetical clauses (where you were probably told in school that you "can't use the future tense").

• If he will hand in his homework, I will correct it.

The first will is deontic only; the second could be either deontic or epistemic.
(Ambiguity, too! Aren't modals fun?)

That means that, since the can part means be able and the will part means be willing, the whole phrase can and will is just a verbing of able and willing. And both parts are necessary.

Modals are tricky that way; every modal auxiliary has an epistemic and a deontic sense, and you always have to figure out which one is intended, because they're not marked and each reading of each modal has its own unique grammar.