They do allow things that are difficult/impossible to get organically. We see this in human food as well. For example, organic gummy bears - gelatin doesn't have to be organic because of the difficulty in finding an organic source.
However, organic does mean that is not supposed to contain any GMO products. That's hard to maintain, as y'all have pointed out. However, we do have a better chance of getting non-gmo by purchasing organic or non-gmo labeled products than if we just throw it all to the wind.
I wish we had a local source for feed around here that didn't grown gmo. I would support them. However, I end up having to buy food from Chewy because it's the only place I can find it and - ironically - cheaper than TSC.
We wanted to order from a place in Ohio, but they require a one ton deliveries to even come to the area. Would love some options. I even looked at growing our own feed but that seems pretty intensive and we don't have enough land for it.