I don't agree. With times languages become obsolete, so from one side they try to "upgrade" their syntax, semantic and internal, from the other side they keep

I don't agree. With times languages become obsolete, so from one side they try to "upgrade" their syntax, semantic and internal, from the other side they keep backward compatibility. Keep adding features on top of something that was not designed for those features will simply create a huge mess to work with. And arguably the oldest languages are the one where you need to follow "best practise", where there are thousands of way to achieve the same goal, etc... It is not bad, but we really need newer languages to move forward the field. Most of them will fail, some of them will fail while having used a great amount of resources, but some will eventually succeed and moving the field forward.