Support speed is a fair thing to focus on, especially when it’s a basic question rather than a complicated account issue. A casino can look fine on the surface, but slow or unclear replies make it hard to feel comfortable using it. I’d want to know whether they answer through live chat or mostly leave people waiting on email.
I’d be more interested in how clear the site is about its terms than flashy games. A decent welcome offer means little if the conditions are hard to follow.