And precisely because of that business model they have absolutely no obligation to keep up the bi-weekly rhythm over the holidays or even offer you something on top of their scheduled announcement such as this change to the daily achievement system.
If the kind of consumers who complained previously in this thread had indeed any saying, I'm fairly sure Anet wouldn't make a single buck with this game because said consumers keep on moaning about "how they don't financially support them till they make proper content" - which of course never happens because they are impossible to please. Empty consumers promises don't look very good on a financial report I'm afraid. They also do not make a company want to work overtime or involve them into decision-making processes.
Based on this research from April 2014, the average revenue per user is about 3.88$ - give or take a few. The important part to consider here is that because there is no actual sub, those players who actually do spend money on the game end up far far higher than this average, meaning they carry a whole bunch of those "complaining free-loaders" I've mentioned.
Since you brought up fairness, next time one complains about the games content or the perceived lack of such, said person might want to consider what his personal average spending per month is and how that stands in relation to what Anet should deliver to that person in return. We might just start seeing more constructive points in the future.
It's not just about content. Hell, I played GW1 for years with no meaningful updates.
But Anet is the one who promised "an expansions worth of content.". They are the ones who claimed we would be getting the same updates as a sub game. I didn't expect it until they promised it.
And I've spent well over $200 on this game expecting them to deliver. Now it's over 2 years in, and nothing to show for it but gimmicky LS segments.
Where are the major game-changing new professions, races, or at least weapons needed to breathe new life into this game?