With Destiny 2: Curse of Osiris being released it seems that players who have not picked up the expansion are now being locked out of some high end content.
The release of Curse of Osiris brought with it plenty of new content and also an increase to the top power level and player level cap. It is here that the first main problem has been found. You see, without the expansion a player is unable to reach the new power level cap of 330. This means that the new Raid Lair and the Prestige variants of the Leviathan and the Nightfall are beyond reach for base game players.
In turn players are now unable to earn The Legend of Acrius which is the exotic shotgun earned through the raid. This means that an exotic from the base game is now locked behind the paywall of the Curse of Osiris. On top of that, the returning heroic strike playlist is now locked behind the expansion even though the Curse of Osiris only brought two new strikes to the game. The Nightfall strike now requires the expansion and this week's Nightfall is The Inverted Spire, a strike from the base game.
The crucible has introduced a new playlist that makes the new expansion maps show up more often. As you might have guessed, no DLC means no access to these maps.
It is common for DLC content to be locked for those who do not purchase it but in the case of Destiny 2: Curse of Osiris, vanilla game content is now locked. Even with the first Destiny content was not locked away like this so as you can expect fans are not best pleased. Seems the Curse of Osiris is having a number of problems right now.