They are meant to be done under leveled. They want you going in at a disadvantage to make it harder. The vast majority of this game is painfully easy. No reason for them to nerf the few hard activities they have.

So here is a story about me learning D2. I used to complain about nightfalls being too difficult and the champs being OP. I used to never touch crucible or even gambit as I was terrified of the PvP side of the game. I mainly played the game solo so there was little I could do on my own. Raids were never a thing, nor GMs nor exotic missions(presage/harbinger), not even legend/master lost sectors. I claimed it all to be OP and BS that bungie would make sure difficult content for those without people to play with. Then I got a few friends to play, and we learned together. Now I can do anything I set my mind to, and I'm even branching out into LFGs(to an certain extent) to find random people to do the new raid with. Unless you have the friends, it's the only way to get those more challenging things done. If you feel that it's not right, or that you can't, then I'm proof that you're wrong. I may not be the best at what I do, but I've been able to build confidence both with my gameplay, and on a social level. It does get better, don't give up or complain about the difficulty, it's there as the next goal you wish to reach.