This behaviour is consistent with general WZI mechanics tbh. If it worked differently to date, the free ride is over. It's Beta folks ... things are going to change. Sine invocation of game, Market Raid got a nerf, Fog Buster got a nerf, some of the Techs (notably the 200% cache bonus) got a nerf.
Passives having low % benefits is how this game rolls.
This was not just a Nerf or a Buff that gently pushes players to do things in a way that was always intended. This was a Game changing Style of Play changing event. which if not changed means a lot of time and thought invested in which cards to keep and which to upgrade has been wasted... And for some players even money spent on buying cards also.
Same for MR & FB ... some folks collected and/or bought them, and now they're worth less (reduced power in game) than they were before. And if you're buying Artifacts ... well ... it's a crap shoot out of the gate. You click an artifact level and get ?some random artifact?, so doesn't seem like a great way to get good artifacts unless you're doing it just to get the right level of fodder to upgrade something you already have.
There have been dozens of "Game changing Style of Play changing events" since WZI started (some good, some not so much). And there will likely be more.
Welcome to Beta! (;
Seriously though, you need to be careful before you use all those Artifact cards as fodder to upgrade to 5 Epics or 1 Legendary, b/c that same artifact could get nerfed next month. Or it might be buffed, but no one's going to complain about that ... but this is actually the case for Actives; and I contemplated using all my Actives as fodder for a long while, and did use some, actually, but now that they got a buff, some are useful again. So glad I didn't Fodder them all.
Just saw Fizzer's note below ... NICE. So stay tuned & see what changes in the next update!
Edited 5/3/2021 18:24:07