Who is letting them off the hook? I absolutely agree this game needs some serious attention or "quality of life" updates... then again, we play more than probably 95% of the population. I think most people give them TOO much credit by saying they're actively screwing people with these nightfall modifier selections, xur items, daily selections, etc... I think that shit is on cruise control and they only step in when they, not we, feel it's necessary.
To me it is an organizational issue that Bungie simply isn't willing to allocate the resources needed to keep up with the demands of the player base on a week to week basis. I'm saying I think their sustain team for the game is much, much smaller than people think and the things they work on day-to-day probably aren't things we'd ever notice ("working as intended" etc etc). When the quality of life stuff gets added to the balance (bounty updates, new PvE events, etc) either existing deadlines/goals get pushed back for this team or more resources have to be allocated to get these things done.
As others have mentioned, their focus is likely on the new content (be it HoW, Comet, "Destiny 2," whatever...). We can all say "well you made this amount of money off of us, you should be putting out new events and bounties weekly/monthly!" but that's not at all how it works. A monthly sub fee is probably the only thing that would bring in the content updates most of us expect on a consistent basis.