It definitely does not play the same anymore, if you truly believe that I have grounds to think that you have not played Viper correctly.
To quote from r/ffxivdiscussion:
Additionally, minimizing the usage of Dread Fangs was a gameplay element that required a bit of attention. Sure, it was not the most in depth or engaging mechanic, but it was a gameplay mechanic that kept people engaged and interested. Checking whether to use Dreadwinder or Dreadfangs was a decision you had to make, based on how the fight progressed.it makes your 1 and 2 combo much more linear as the only intersection is on the 3rd button press no longer on the 2nd
1-1-1 / 1-1-2 / 2-2-1 / 2-2-2
are the only variations now, removing these:
1-2-1 / 1-2-2 / 2-1-1 / 2-1-2
which kind of removes the more interesting aspect of the viper basic combos