Javascript might not add much value to the reader/end user, but it can/might have made building the above 3 functionalities much faster and easier for the devel

Javascript might not add much value to the reader/end user, but it can/might have made building the above 3 functionalities much faster and easier for the developer. Without Javascript we simply might not have all those great content to begin with. So if it makes the content creators' lives a bit easier, the cost of making the job harder for a small group of end users might be worthwhile.