If the amount of XP required 90-100 was increased because three quarters of quests were missed due to players leveling too quickly, is that also "artificial prolonging of content" and a "pure business move"?
If the cost of pre-raid gear (justice, valor, etc) was increased because they let players get pre-raid decked in mere hours, is that also "artificial prolonging of content" and a "pure business move"?
If the drop chance of gear was decreased because it's now less likely to give you a duplicate, is that also "artificial prolonging of content" and a "pure business move"?
If professions gets recipes with mats that require a fair amount of farming/effort to gather, is that also "artificial prolonging of content" and a "pure business move"?
If mobs and bosses in dungeons and raids gets their health increased because they were dying too quickly for the level, is that also "artificial prolonging of content" and a "pure business move"?
If the world felt scarce and more roaming mobs were added for a sense of danger, is that also "artificial prolonging of content" and a "pure business move"?
If Garrisons aren't instantly maximized the moment you hit 100, is that also "artificial prolonging of content" and a "pure business move"?
If the gear requirement for raids were increased slightly because of balancing itemlevels, is that also "artificial prolonging of content" and a "pure business move"?
If the amount of nodes were decreased because they were flooding the economy, is that also "artificial prolonging of content" and a "pure business move"?
If there isn't a flight patch every ten yards, is that also "artificial prolonging of content" and a "pure business move"?
If large quest chains would make you travel across zones, not just locally, is that also "artificial prolonging of content" and a "pure business move"?
Every-fucking-thing in the game can be accused of being made purely to slow you down.
Proper design is what it is.