Alternately, if new features aren't needed, dev builds could add instability for no gain. I pretty much always stick with "official" stable builds, and upgrade only if I need something that isn't in stable.
And in that regard, I would agree. When it comes to DOSBox, however, I rarely touch the stock build unless there's a compatibility issue with a DOS game that pops up in the SVN builds. Mainly error throws or sound inaccuracies from time to time. However, the SVN builds have features like: 3dfx emulation, newer render outputs, better OPL3 and GUS emulation, built-in MT-32 emulation, and a couple of others that I just don't bother with the stock build anymore.
Granted, that's not going to apply to every program/emulator out there.