Vault events are part of the weekend event cycle, which spans 6 weeks, you confirmed that yourself. Events sometimes get shifted around by a week, both forward and backward, that doesn’t change that there’s one vault event every 6 weeks on average.
Let’s look at the math. The last “regular” vault event was beginning of December. We now get one in February, March and April. That’s 3 vault events within 16 - 20 weeks, depending on when the third one in April is going to be held. This averages out to the regular one vault event every 6 weeks, there just isn’t anything extra there.
Which gets us the core issue that has slowly been destroying this game for years now, communication. And I’m also not trying to be mean here.
If there had been some announcement well ahead, like at the beginning of December, that the by far most popular weekend event, vault, would be skipped in the next event cycle, the community would have been unhappy. That’s a range from grumbling to shouting, depending on the reason given for skipping the vault event. It probably wouldn’t have lasted long, people tend to lose focus and move on.
What actually happened was radio silence. The community eventually noticed the distinct lack of the next vault event and asked several times what is going on, which resulted in more radio silence. This overlapped with the ban fiasco, which handed out a “compensation” that didn’t even remotely cover the cost the banned players had paid for all the event sigils that expired unused, due to the incorrect bans. And which also didn’t even remotely cover the cost of guild members having to bail in with extra shop tiers, due to their most active players being unable to play.
To sweeten that turd an extra vault event was promised. And at this point, after all the extended radio silence, presenting “extra” as “hey, we silently removed one vault event from the schedule, never told you about it, never responded to your questions, but this regular vault event is really an extra one you wouldn’t have received otherwise, trust us” really begs for this interpretation:
There’s also the Krinkle nerf. This troop was sold as map generator, the feature was “temporarily” removed to analyze the ban issue, then quickly found to not be the cause. Now, almost two months after the ban issue has been declared resolved, Krinkle is still not generating maps, and there don’t seem to be any real plans to ever return them. Please communicate, because this definitely shouts “we noticed we are selling maps for real money, the ban issue was a convenient excuse to make sure it stays that way”.