Hi Baloo!
My name is Sumit and I’m a mapper in the OSM team at Lyft.
There are different approaches on the OSM for adding turn:lanes. Our general approach is to add lanes and turn:lanes tags only when there are visible turn markings on the road or signs showing possible turns.
In this changeset, I only saw a marking for a left turn, so I used left|none. Your approach also makes sense — from the last lane, you can go through and right. We have also started a forum discussion on that topic (https://community.openstreetmap.org/t/consensus-regarding-lane-and-turn-lane-tagging-guidelines/133364) outlining our approach in more details and will be glad to participate in the discussion further there.
Thanks for your comment and your contribution to OSM! 
Best regards,
Sumit
