Your builds suck and you don't pay attention to where you're standing.
You have the same mods as everyone else now. You have the internet and YouTube if you are illiterate and can't think for yourself.
You're playing a team based game but refuse to make friends to consistently play with. You make excuses for why you can't succeed at your effort rather than trying to find solutions for the difficulty.
Edit: The game should be more REWARDING for each tier of difficulty though if Bungie is listen for anything more than regurgitating.
Lost sectors should be retuned specifically as they aren't rewarding enough for the time spent and the difficulty of them. But this isn't the whole of the game.
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+1. If you're not setting your builds up for best possible outcome, you should be ok with just doing basic stuff like vanguard ops, crucible, gambit and regular patrol missions. You shouldn't be able to do public events or terminal solo. Lost sectors solo should be difficult if you're not building properly. Nightfalls, dungeons and raids should be difficult as they should be done with teams and proper builds\roles.