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The problem is the Catechism uses proof texts, sometimes out of context.. that a clearly written systematic scriptural Theology text or even a solid commentary would not allow for..

The Catechism isn't and isn't meant to be systematic theology (or a commentary for that matter) -- it's a summary of what the Church teaches. (Not sure what a "systematic scriptural Theology text" might be.)

And it doesn't use "proof texts" in any generally accepted understanding of the term. The "proof text" is whipping out one or several Scriptural verses and letting them stand alone (apparently deliberately ignoring the other Scriptural verses that offer a different or even apparently contradictory understanding), whether they're on point or not (anyway the way they're used on FR!). I believe historically this use of the proof text came in with Protestantism and -- in serious circles, at least -- was dead by the 18th century, because of its serious drawbacks, among them the "bumper sticker" approach to theology they represent and the incessant battles of the "dueling proof texts" that advanced no argument.

Adducing Scriptural sources in the course of an exposition or argument is a different thing altogether.