Dev team already stated that the player base is divided in terms of skills. The skill gap is huge. People were either doing good or extremely bad. With SB they are hopping to lift the lower players up by simplifying rotations.

SSS dummies will tell you that you have enough dps to down content. This does not mean that your rotaion is good or perfect.
But at least you will have a rough idea about your rotation.

If you are doing well on dummy and downing it with 10s+ left.
Next step will be trying to keep up your rotaion mid fight. Learn how to recover from mistakes.
Dps should improve as you learn the fight. Learn when to use or save CDs. Dummy does not teach you this.

Parse is a useful tool in the good hands.
Not everyone using it will benefit from it. So don't generalize that having parse will make better players.

I am not against having a parse, but so many players are already doing good dps without it.
These are the players that care to improve with or without a parse. Wish there were more people like them.