As others have been pointing out in this thread, it can lead to issues of power creeping if there is a constant series of buffs and not reductions. You generally don’t want to do this unless you have a host of heroes that are collectively seen as weak or in need of buffs to improve their viability.
At the moment, no. There’s been several pretty hefty reductions over the past few patches and past series.
This recent patch, for example, saw a collective reduction in damage reduction stacking via heroes that could do this, such as Orisa, Doomfist, and Ramattra. Placing a hard cap of 50%.
The last real power creep occurred with Supports back in OW1, and towards Tanks when GOATS ended its rein when OW1 entered its Role-Queue phase.
To be fair, there are plenty of Supports that do as well as Illari does in sustain, or better. However, it isn’t really in the best interests for Illari to have the kind of sustain she does have, while also having the kind of firepower she has (and I mostly point at Captive Sun, here and not her weapon).
Collectively, Ramattra as seen a near 40% increase in Ult Charge cost since his introduction.
Not everything can be seen as a power creep, you have look very specifically at the trends of what’s going on.
Part of this is because he’s not winning games. Note that his healing isn’t seeing consistent increases since his introduction, as they have recorded and stated that he is one of the highest effective healers in the game. They’re happy with that, but there are other avenues where they can increase his power to be competitive.
The original idea was that his devices such as Petal Platform and Tree of Life would be powerful tools, and create a lot of value for the players. That did not happen, nor did it appear to create that value. So it seemed that Lifeweaver was lacking in “power” in his original kit and needed improvements where they could put them.
We’ll see where they go from here.
Most of this is false.
They generally are capable of this.