Or it could mean as a funded company Docker has more resources than a low profile open source project like LXC to reach out and generate interest and adoption.
There is undeniable confusion about LXC and Docker with a lot of folks whose first introduction to containers is via Docker who seem to think LXC is 'low level kernel capabilities' as it is mistakenly referred to on the Docker website, and since Docker was based on LXC they at least should be clear what LXC is.
The fact that LXC is an advanced project baking since 2009, supported by Ubuntu since 2012 which provides perfectly usable Linux containers, wide choice of OS templates, features like unprivileged containers and is easier to use than Docker is often lost in the noise.
LXC provides you system containers, Docker takes that base that to provide app containers, and there is definitely interest and value in that but it's a single use case of Linux containers. Would you want to reduce a container to an app for all use cases?
To conflate a single use case to container technology itself is a mistake, apart from the fact that once you go down a custom container format you will need to expend engineering resources to figure out how to make a lot of things like clustering, services, apps, networking that expect a normal OS environment work with the constraints.