Respectfully no. No one should stop advocating for wanting to see a character they like to used used meaningfully. And those many other favorite characters you mentioned have fans who feel the same way as Ev's fans. They want their fave character to appear. As for not knowing the line-up, you're quite correct, we don't know but what is the purpose of keeping Ev or any other character a secret but other team members have been named.
You seem to confuse whining and anger with people advocating for their favorite characters. If that's true then every person in this forum is whiny and angry. Now, I'm not making assumptions about anyone's emotional state but if people are posting in a specific characters' appreciation thread about their use or lack thereof, then it must mean that they care about this character. That nothing new or shocking, in fact it's expected.
I hope that you are indeed correct about there being a hidden agenda for not mentioning Ev on any of the six announced titles coming up for the relaunch so far. Maybe we can be pleasantly surprised.