Thanks to those Navagraha doshas, folks confront different obstructions & hindrances in their lifetime. In order to reduce and negate the malefic doshas or malefic affect of those planets, we conduct many Pujas & Yagnas. Another etymology suggests that valga indicates "to paralyze" and symbolizes the strength of stambhana, "paralysis" https://www.youtube.com/shorts/5VeSyP9JRw0