In order to get Dawning Engrams, you have to complete event-specific quests. No big deal, right? There's just one problem: you can only earn three of those engrams per week, one up front and two through challenges. And that's per account, not per character. Even if you play every day and get perfect, non-duplicate drops (which you won't), you'll only get a fraction of the 59 items available during The Dawning's 3-week run. You can buy gear with the game's free Bright Dust currency, but it's hard to earn in any significant amount. In short: if you don't pay real cash, most of this content will disappear forever (or at least, until the next holiday).
Players have griped about cosmetic engrams and the Eververse marketplace ever since Destiny 2 launched (and really, since Eververse first appeared in the original game). However, the holiday event has amplified those complaints, with many arguing that Bungie should either drop Dawning engrams during ordinary activities (and thus increase your chances of getting it for free) or ditch Eververse outright.
Bungie is aware of the outcry, but just what it'll do remains to be seen. Game Director Christopher Barrett said that developers "hear your feedback on Eververse," and agrees that players should "feel respected." The team is unsurprisingly on a holiday break, though, and an update on what's next will come "after the new year." That is, you might not see a change in strategy until after The Dawning ends on January 9th. While that wouldn't be a disaster (The Dawning itself has plenty of activities), the underlying problems might only be fixed when it's too late to earn the gear you really want.