Well now you're assuming what I'm assuming, which is fair enough because I assumed by your comment that you were saying the UI responsiveness isn't really a concern in DAWs. It's definitely a secondary concern, but people are accustomed to buttery smooth UIs and complain when they're not.

That said, I'd argue that even latency is still a concern for things like meters. If they are noticeably out of sync with what you hear then users will again complain.