Personally, my opinion is we need a lot of safer poke type moves. I can deal with the strings, as horrible as they are, because, if they give us good pokes, it'll be beaten out with a strong spacing game anyway, for the most part, especially because last I checked, DOA had BDC's (not so sure about 5 in current build.) But, I agree with the -1 -> -4 of current ideology. That kind of safety in some moves promotes movement, but forces the person to use higher risks to attempt more effective maneuvers. As far as frame traps, sure, it'd be nice, but in a game that, as it is, promotes so much other craziness, adding thought to already fast mix-up isn't exactly something we might want to do at this point in time, IMO. I like having backdashes depending on the character, but the thing is, if there can't at least be a "Minimum" backdash for a character to help their effectiveness, then it needs to be universal.
Also, stunning the defender shouldn't be rewarding in DOA. It's not only easy to do, but easy to do blindfolded. With string delay, and all that other crap, there's no reason it should be rewarded in DOA, as far as I'm concerned.
Personally, my biggest concern about having a bunch of unholdable stuns, is the fact of how easy and assisted it is to stun somebody. Honestly, what I'd really want is something in the middle of DOA and VF, with DOA being unsafety universe compensate with string delay, and VF being EVERYTHING IS SAFEZ EXCEPT BACKFLIP KICKS AND LAUNCHERZ! You know?
Like a system that balances safety, usability, and impact speed between movesets.
As long as it's as easy as it is to stun somebody, adding a bunch of unholdable stuns would just result in the opposite of DOA4. As in offense rules. And, while that would be "cooler" to look at, you know, combo century and all, it still would be just as bad, just in the opposite way.
Offense and defense need to be balanced. In a perfect world, the Defensive Hold, and the Unholdable DOA stun could balance each other out in terms of mechanics, but then they added a bunch of unnecessary crap to the system.