Back to the OP topic. Ostwind doesn't need suppression as it's pretty lethal as is. I had no clue that Centaurs Strafe ability had suppression because it usually either whiffs or deletes whatever squad that other player usually forgot about. Even then it's not like the Stafe ability gets much use from my experience since Centaur usually gets relegated to AA role if it gets built at all... Either way the comparison to Centaur is no real justification for Ostwind suppression.
+1
I use the centaur strafe ability where possible and I've also never seen suppression from it. I've seen infantry go prone and crawl like when mortar shells land near them sometimes, but never actually get suppressed. Plus any infantry that actually gets in the path of strafe disintegrates.