"Just remember, you have no control over the ingredients brought to you. If you want a perfect moth wing herb, then you better be out there with an herbalist and an adventurer team to get it. The best herbs I have seen are hand picked and grown by the alchemists have always yielded better results!" Walker seemed to have come at the perfect time. Remey sounded like she had just ended a grand speech about the values in gathering her own herbs.
Walker couldn't deny this. He was also way happier when he would eat foods he and the party had hunted on their adventures. The same must be said for potions. Since the alchemist would have gone out and seen the struggle to get the herbs then they would take more care through the potion making process. This would inevitably end up with more things learned and a better potion made.