I think Bungie mistook "challenging" for "long and boring" - it's just not fun pew pew pew pew pew pew pewing the same servitor for a half hour until he dies, to just move on to the next one, then the next one, then running around in a circle and doing it again. The Kaliks and Skrolas fight back to back is just an incredibly long and boring time suck. I am quite disappointed in it.
I am not even joking, and not even exaggerating: I literally fell asleep last night during both battles. My teammates had to call out to me and ask why I was just standing there, and I was like "OH man sorry I just dozed off" then resumed shooting the same enemies over and over again. And despite falling asleep 2-3 times MID BATTLE, we still won.
Not a good look, and not a fun fight. I miss raids.
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35 PoE, for my first time fighting through it, was fun. I've never played when there was burn. The first time there we wipe, as I didn't know much of what to expect, got him down to about 1/8 life then f-ed up. Then tried to rush the fight and that just ended badly. I'm sorry you all that agree with the OP, feel that the fight is boring. I'm sorry you don't understand what the Devs want us to do in this game. You people are spoiled. TTK should be a fight for a boss. You should relish that fact that the boss is at 50% life. If you people understood not every fight is only 30 seconds.