Ok so ph is crucial in both organic and synthetic runs, but synthetic ph modifiers will affect soil biome. However if your ph is wrong then your soil/soil biome needs adjustment anyways. Ph determines nutrient availability in a soil so if that’s wrong it doesn’t matter if it’s organic or not you will have issues. The reason you heard you shouldn’t have to worry about it is because most organic substrates/amendments tend to sit at a good ph, but blanket statements are rarely your friend.