Thanks, I will read that wiki page.

However, it may do harm to do it like this, as it may violate the principle to not draw lanes as separate OSM ways if they are not physically separated (when there are no separating kerbs).
Also some people claim drawing it your way helps navigation apps, but that does not seem true as I have driven a car through the rounadabout on the west and the GPS cannot really distinguish in which lane you are driving, so it is giving you invalid instructions.
I have already reverted some cases of these turbo-roundabouts and remodelled them using the *:lanes tags and connectivity relations, you can see e.g. at https://www.openstreetmap.org/#map=19/48.092562/17.121643 .