I agree with you and yes, Nvivo, MaxQDA, Atlas.ti are all softwares for quantitative and qualitative data analysis. My suggestion would bring DT3 closer to them, but I can see why this would be difficult: these are all big companies that charge thousands of dollars for their software.
As a matter of fact, I have a temporary student license for MaxQDA and while I do find it useful from time to time, DT3 is much closer to what I really need. Most of the time I use it in a similar way to what a windows software called Connected Text does very well, perhaps you heard of it. Still DT3 is obviously richer in features and more open-ended than Connected Text and from time to time I do take advantage of that.