Some info here:
https://forums.warframe.com/topic/1067436-patch-2440-mesas-peacemaker-not-working-anymore-as-intended/?do=findComment&comment=10591474
Arcane Change/Fix:
As often happens with Mainline - unexpected bugs popup. In the case of last week's 24.4.0 Mainline Update, we quickly received reports that Arcane Velocity was not working on Mesa's Regulators. Considering Mesa's popularity, it's no coincidence that this was noticed right away. We want to go into detail about what happened between Thursday and now, what's being fixed, and what next steps are:
From Thursday to today:
1) Between Thursday and now - we've had issues internally on intention, which are typically the hardest to communicate when we're also trying to diagnose a bug. As of now, players know we may intend to keep Arcane Velocity from working while Mesa is in Peacemaker
2) Between Thursday and now, many other prior-functioning Arcane + Abilities broke as well, leading to further confusion on intention.
What's being fixed:
Today we found the bug that caused this issue - a single fix intended to let Dispatch Overdrive work on Garuda's Talons indirectly broke many Arcane + Warfame Ability functionalities.
1) We have Restored Arcanes not triggering from Exalted weapons across the board by reverting the change made in Update 24.4.0:
Dispatch Overdrive now applies to Garuda’s Talons when equipped.
Next steps:
While players have restored functionality now (i.e Mesa + Arcane Velocity), it won't be a true solution if you don't know the dev teams intention. We unintentionally broke some arcane interactions and let it ride when we shouldn't have. We're fixing that today! We do think there are some balance issues remaining but it is not our intention to use side-effects to solve.
Balance is a conversation that we constantly have, and we see you having as well. For some people the answer is don't nerf things, buff everything else. This is the path of least resistance for us, as most of the player base is happy when we buff, and angry when we nerf. However this has a few side effects that impact the game as a whole. First, with more damage, the time to kill on enemies is lowered and the value of Crowd Control declines even more (Vauban?!). Higher max damage also means that players with the latest bells and whistles can easily kill bosses in an instant, and overcome any challenge with ease. The more your play, the easier the game gets!
So far we have been kicking the can down the road, accepting power creep and its consequences on the game - and often this game is a 'kill all the things' based game. We've mostly done nerfs on things that could be automated, required no player interaction or removed options from the game by making all other choices bad. We will continue to wrestle with this, but the most important part is when and if we decide major balance changes are needed, we will let you know and it will be the result of a lot of consideration. Design changes like this need to be more tempered and considered.
Thanks for hanging in there through all this confusion. Six years in and we are still learning how to do this.