Hi!
My name is Stepan and I am a mapper on the OSM team at Lyft.
According to OSM wiki tag construction is used to denote active construction sites that typically take several years to complete. 

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

These edits are designed to make traffic safer. As you mentioned, the construction on the motorway will last for an extended period of time. If we leave it without modifying the geometry and the construction tag, it would interfere with localization and confuse the users.
I think it would be better for the map users to see the current road situation.
As motorways are high-traffic roads any changes are noticed quickly and I think as soon as the construction work on the road is over, the geometry of the road will be corrected in a short period. 

Thank you for your contribution,
Stepan