I wouldn't consider a Lutron light switch to be a direct comparison to Crestron. Crestron targets the ultra wealthy by being very reliable (assuming setup by a competent programmer) with unified control of pretty much everything household - shades, lights, audio, video, etc. They're aiming for the kind of people who will pay a premium to make sure their house just works, every time, without having to deal with tech issues.

You could certainly bodge together a similar system for less money, but the controls won't be as nice and it'll be nowhere near as hassle free long term. HomeAssistant and competitors have really been catching up in the past few years though, i'm excited to see competition in the market. I wish they could all play nice together with reasonable APIs :/