Later in the game when it has a open world, yes.
Initially it'll just be a flower that spawns per encounter, so only one player can see and interact with it. Thus it's not reallt unique or serialised, if that player fails to extract it, it's just the player that loses out, others are unaffected by this.
Later however new lowskilled players will make it annoying for others farming the mats who have a higher chance to extract them. However, you also gotta remember that materials are also split up based on levels. For instance, extracting a low level flower is only useful for healers at the lower levels and crafters, as those mats for those potions/ammo/other crafts are mainly useful for lower level and mana healers as they will only return a certain amount of mana or other resources.
Meaning, higher level healers and crafters are better off in higher level zones than sitting in starter level zones and stealing low level flowers off of beginner healers. They will still be able to, but the only advantage is that they're more likely to successfully extract it with the first try to then maybe sell it to the lower level crafters who need it.
I probably went too deep into things but there's a lot of variables involved, early on its more of a "single player" experience partially.