Nowadays in many houses there are few books, I do not say that the books have disappeared completely, much less that they are not read, but between the digital format and the loans, the number of paper books in property has been reduced considerably. So a large library furniture in the living room no longer makes sense, you can arrive with a small bookcase, maybe even with a table.
A table shelf can have its advantages, especially since it is not necessary to hang it on the wall, that implies that we do not need to call a friend or relative to come with a drill, which we are ducks when it comes to making holes and that if we want to change the room shelf, We can do it at any time, but it also has drawbacks.
Yes we place the bookshelf on a table, we will be disabling the surface of this, every time we need to use the table we will have to move the shelf and if it weighs a lot because it has many books we will have to empty it before. Also, if we are not very careful, it is possible that the bookcase ends up scratching the surface of the table or leaving a mark, so that the idea at all does not convince me, I think that although I have to seek help with the holes it compensates me a shelf hanging or resting on the floor, narrow and attached to the wall.