correct, hdvrf was a trick to support a common point for LI tapping back years ago we did it in IOS (for 6400), it carried forward on later to nexgen BNG platforms like c10k and eventually a1k had to have it also. For the XR bng implementation we did LI support directly on subscribers.
for non BNG, the LI capability was already there on any type of (sub) interface and type.
So there was no need to carry HDVRF forward in xR for that reason other then possible legacy and migration scenarios.
If moving traffic between directions in a different vrf is a must, a trick with aBF can be done by setting the interface in one vrf (for downstream) and using ABF with a nexthop in a different vrf for upstream.
This document is an early notification of a behaviour change that will be introduced in IOS XR release 6.5.
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