What would be the benefits of Bluetooth other than convenience? Most of the Bluetooth Codecs are lossy and avoided by most of the people interested in a DAC like this for good reasons... But a 4pin connector could be nice though.
None, convenience is also the same ordeal from a 4-pin XLR (you can buy a balanced amp otherwise for less than $200 these days). So both are convenience. Also I'm not sure why it would be "avoided by people buying this sort of DAC", this DAC is precisely a convenience monster with it's wealth of features (pretty much why I bought one). Also everyone has a Bluetooth enabled phone, with streaming services this is almost becoming essential in my personal view, it would be nice not having to boot up a PC at times as well even if listening to music loaded on your phone's storage.
The reason I am saying the revisions should stop, is because it's been a while, and features like I listed are already becoming common place among other DACs, and certainly ones at this price range.
If this was a purely performance driven DAC, then I would understand, it's targeting raw specs, so who cares for secondary features. But this is another release, yet still basically the same as the prior two.
Another reason why this isn't good, is it lowers the value of the prior DACs. People looking to get a new one perhaps second hand, aren't too interested in getting an older version (this goes for any type of product), and since the old ones aren't being really sold brand new at MSRP, their secondary value falls. It's just simply not a good look. But this is something I personally don't really care about, and I'm mentioning it because I heard someone make this point and it made sense.
Come to think of it, there is another feature, a streamer perhaps, or music player (like the latest Matrix Audio DAC/AMP/Streamer). This would also be something they should look to add. Put that screen to even more use and such.
Obviously this successor DAC I don't expect to cost the same as the current version if it's going to have all 3 of these things. But having something like Bluetooth and XLR 4-pin out, isn't something I'd expect should cost a fortune. Though the streamer/local storage player function I imagine with the combination with the prior two features I just mentioned, would be a substantial cost increase due to all the support that would be required for streamer capability, and all the UI work that would need to be done and software work to get something like a streamer going.
So Bluetooth + XLR for the next revision (at least one of these for goodness sake). And for the higher tier upgrade, add the streamer + local player at higher cost.