I see what you're saying and agree to a point. I do believe realism is needed. But I also think abstract is needed.
Realism is a CLEAR message word-picture. Most of the interpretation was done by the artist who did the work. A viewer simply looks and sees/hears the message. It's kind of like going to church to hear a sermon.
There is thinking and personal reflection in realism to a certain extent but the nature of the work greatly limits this.
If the truth were known; most people in the world greatly prefer realism. It's easy and leads quickly into invoking some emotion or experience from the past. The artist, if really good at his craft, will almost always accomplish this result via his painted illusion (all paintings are mere illusions).
In abstract work we're drawing out of the viewer what is inside of him or her in a more effective way. Instead of cramming a message down the viewer’s throat, the abstract artist says: "What do you see?"
True abstract paintings are not just scribbles and wiggles on canvas. A good abstract painter considers the whole canvas before doing the work. He has some idea of his goal before painting. Just as Jackson Pollock did before he painted. However, even Pollock said that sometimes he "lost a painting." He might not sign it and throw it away. It didn't communicate what he wanted it to communicate.
Abstract art done right does very powerfully communicate. But its message is not "one size fits all." Colors, patterns, etc., these all draw out of us what's inside. How exactly it accomplishes this is a mystery even to this day.
Those specialists who deal with the severely mentally challenged often have them draw what they feel. These drawings are studied and while most unlearned persons would say they mean nothing--they can mean a great deal to those with knowledge. In fact several years ago a book (I forget the title) was done on this very subject.
The point being that even what looks like scribbling to some can mean something. Is it easy to receive? Maybe not. But certain colors and patterns have a strange way of drawing out what is hidden deep within. I’ve seen this happen to people who said they hated abstract art. Some of these eventually become its greatest defenders.