Do these gates belong to the relation ?

So,

I created the first relation in my life. Here it is
http://www.openstreetmap.org/relation/7725174#map=18/40.46997/17.24982

The 2 pedestrian areas are for large sidewalks with oak trees (and street lamps, trash bins, a bus stop and some gates and fences)

Here are a couple of photo albums
https://photos.app.goo.gl/lIthBh5hGa7EZQXB3

and

https://photos.app.goo.gl/gWYpMAA5A62Xmu1Q2

My question is:

The 2 pedestrian areas (the large sidewalks) belong to the relation, because they’ re part of the street

What about the gates delimiting the areas ? Should they belong to the relation too ? Or is their delimiting the area enough ?

And the same question holds for the trees and street lamps. Should they belong to the relation too ? Or is their position inside the areas enough ?

Also the addresses belonging to the relation all have both the addr:street tag and the addr:housenumber tag
Isn’ t the addr:street tag superfluous ? Isn’ t that information covered by the belonging to the relation ?