[JMTQp8lwXL]

Over time requirements and feature sets tend to grow, and if those features include client-side updates, with enough time you'll end up with jQuery Spaghetti, which is exactly what happened to many server-side render web applications built in the years preceding the early 2010s.

[uk_programmer]

Well I would argue that is because many of the developers writing those weren't really JavaScript developers. It is quite easy to keep things tidy if you just keep to some basic JavaScript patterns which aren't very different than some of the patterns promoted on the server side.

The problem is that JavaScript just isn't that well understood and this is partially because superficially it looks very similar to C# and Java.