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All Android TV devices support Chromecast. If you see a device that doesn't then it is not Android TV. It is a junk Android device.
Android TV is a specific operating system. A lot of cheap devices primarily from China will use the regular Android (phone) software that is free to use, but doesn't have all the features of Android TV.
AndroidTV.com has the very short list of official Android TV devices.
Just check XDA and see if you can find a ROM with it.
Yeah ignore those two jerks, they try to act like mods but only show their ignorance.
Those Mecool devices run AndroidTV, however it is not officially authorised by Google which is needed to have Chromecast support. So yeah it's a software limitation, and you won't get it without the certificates. Airscreen's version is very limited, works mostly for mirroring and YouTube, but won't work with casting Netflix or anything with DRM.
AFAIK there is only one Mecool that has Chromecast support, and that's the latest KM8.
You could also consider another device, the Jetstream.