In general we try to avoid absolutes and provide support as much as possible.
Example with Centos:
Sometimes there are very generic questions here, such as how to use fdisk - Create new partition with fdisk
I think we are sometimes too quick to close these questions and it is frustrating to users to have questions closed.
fdisk is, at least with respect to this specific question, the same across all distros.
I am sure you can find some difference in
fdisk between distros as well, but again, with regard to the question I linked, it is the same.
IMO - answer the question and suggest they use an alternate means of support for Centos ;)
With that in mind, it is a community drive site, so the question was closed by consensus, and I am good with that as well in that the advantages of community moderation outweigh the disadvantages.
Crouton uses the ARM architecture, and again it depends. In general there is going to be a bias to close such questions as off topic, same as Mint, Centos, or any other distro as IMO , although supported, it is still in development.
A similar situation occurs with Ubuntu +1. At the time of this post, Ubuntu 15.10 is in development. As such it is an official release and it is supported by Canonical, but as it is in development it is not supported here until closer to the release date.
Crouton / ARM is similar to Ubuntu +1 , supported by Canonical as a work in progress, but not necessarily supported here as it is still in development.
As with the Centos question I linked, however, there may be a more generic question in regards to Crouton / ARM. IMO, in such situations, we should try to support such questions and re-direct to the ARM team - https://wiki.ubuntu.com/ARMTeam