Cisco representative has tried to tell me lately there is feature parity between platforms on IOS XR. In general maybe there is, but in details not. My previous example about lack of GRE tunnels is not valid anymore as this feature has been added in release 3.9.2 on ASR 9000 routers. The configuration of GRE tunnels would not be commited previously because it was not supported.
Things are different when you try to implement authentication for EIGRP neighbors using key chains. This feature, according to official configuration guide, is not supported in IOS XR on ASR 9000 platform, but is supported on CRS-1. So the configuration like that should not be validated and commited
key chain test key 1 key-string password 12345 ! router eigrp 65500 address-family ipv4 interface Bundle-Ether1.100 authentication keychain test
To bad in this case, even if this feature is not supported, IOS XR CLI would let configuration to be commited. Just no neighborship will be established ever that link.
EIGRP authentication is not supported on 3.9 nor 4.0 release of IOS XR.