The programmers from DevPro are capable of fixing card mistakes in a timely manner, though I do agree that they should test their updates more as there are occasional obvious glitches. If you really do not want to play against cards that have glitches, you can just choose to play TCG-mode, which is not an option available for DN for those who wish to play specific formats. As well as how people may avoid the certain card(s) if the glitches are well known.
Honestly, If I can get games faster and more effeciently on dn, with faster play, and no probabilities of seeing shitty unconfirmed card text, why would I need this? Its a good idea, but I find dn much more convenient.
Have you ever played on DevPro before? Games on DevPro go much faster than on DN. Flash and Shockwave have the tendency to lag or crash, while DevPro can go as fast as 40~60 FPS as long as one player is not stalling as it does not run on shitty Adobe. When using a card that searches from the deck, DevPro only shows you the selectable choices, and cards like Photon Sabre Tiger or Genex Undine that can only search for a certain card will just add it without you needing to dig through the entire deck. Not to mention that the built-in rulings save you time from waiting on admins to resolve rulings with ignorant players.
Given that the cards have no glitches, DevPro is also more efficient as a dueling simulator. It helps you practice playing the game properly by recognizing proper chain orders, rulings, and other specific things that are good to know for certain cards. It is true that the cards are not always programmed correctly, but those are only new cards that were not tested before release usually. Every card legal in the TCG that does not conflict with OCG rulings significantly, such as Swap Frog (which was recently fixed to follow the TCG rulings instead of OCG), currently works fine.
Of course, I have to concede that DN still has features that DevPro has not achieved yet. DN has the option to watch duels after they have started, where DevPro only lets you watch it before it starts. DN also is better for those with grandpa computers, or using public computers, as DN is browser-based. Since it is also manual, it lets you proxy cards that are not released yet.
I however believe that DevPro’s good points outweigh the bad. The extra features such as saving replays of duels, using your own customization instead of the unlockable ones exclusive to DN, Tag Dueling, Anime option, and much more that add more variety to the game. I am glad that DevPro is gaining publicity, and I would prefer if it were a legitimate option for wars so that I would not need to use DN as much.