You didn't see that type of "crap" in Raid Rifts or Expert Rifts because those were designed for a specific sized group. Experts Rifts were for a group of 5, Raid Rifts for a group of 10. Everyone trivialized the content by taking more than that though. Hunt Rifts SCALE to the size of the group. The difficulty stays the same if there is 1 person or 100 there. The shield makes is take just as long for 100 people to kill it as 1 would solo. This way you cannot trivialize the content by bringing 2-4 times the number of people the content was designed for. It is designed for however many you bring.
IT DOES SCALE. That is the exact point of the shield you complain about, then say it needs to scale.
Learn to understand what the mechanics are and what they are doing before you go complaining and calling the devs dumb.