[Tagging] Historic building usage

[Dave F]

Hi

I've a building to tag which used to be a train_station but currently 
has a different use.

https://wiki.openstreetmap.org/wiki/Key:historic

This page recommends historic=building, but I don't see how that's 
beneficial. It can't be tagged to describe it's historic use. Building=* 
should be used to describe what it is now.

Wouldn't historic:building=* be better?

DaveF