One place this works, when your clients are able and willing to use the latest browsers to use your software. The primary benefit is that I don't have to rely

One place this works, when your clients are able and willing to use the latest browsers to use your software. The primary benefit is that I don't have to rely on hacks. This is how I build the backend to my CMS and my clients are happy to keep their browsers updated. (nearly trivial to do these days). This also means that as soon as I see a new JS/CSS feature that will eventually become mainstream, I can use it in my admin as soon as both major browsers (Firefox/Chrome) support it. And even sooner if it's not a critical feature. (eg, I can skip adding a feature like "lazy loading" because browsers will have it built in eventually, etc...) On the public facing front end, that is a different story though. It's motivation to keep things simple.