When we slouch, we've got over shortened muscles in front and over stretched muscles in back. When you go for the posture in photo #2, you get the reverse: over shortened, tight muscles in back, and over lengthened in front. Although stretching into an unnatural position to "correct" the effects of a long-time bad habit may seem like a shortcut to improve a slouch, I believe that it results in layering one bad habit (too much tension) on top of another (too much collapse).
I believe we are better off choosing to be upright without adding extra muscular tension. Allow upright, but don't force upright. It might seem like it takes longer for things to change, but I'd rather remove bad habits and unnecessary tension than add them.
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