It's a good decision. The bench back here is not better than the players at SAF. I find it very smart by the selectors not to pick Razin for Tests this time. He is 100% not fit for SAF's fast and bouncy soil.
﴾اَلَاۤ اِنَّ اَوۡلِيَآءَ اللّٰهِ لَا خَوۡفٌ عَلَيۡهِمۡ وَلَا هُمۡ يَحۡزَنُوۡنَ ۖ ۚ ﴿۶۲
"Listen, the friends of Allah shall have no fear, nor shall they grieve" (Yunus: 62)