A major reply toward the question of “why is everyone dumping their ults”, it becomes second nature to do so as a “last ditch effort” that i’ve seen numerous times in both quick play and competitive (at least, for platinum and lower, i can’t speak for anything above).
You use what you have to get onto the point, if the whole team has ults, and there’s a lack of proper coordination (another major problem i’ve frequently seen), people tend to push out all the ults without thinking, my example was a specific situation that could very well happen, it could’ve gone another way as well such as nanoing the reinhardt, but if the defending mercy knows ults haven’t been used throughout the rear end of the game, she may know they’re being stockpiled and be prepared in that sense and hide away, also the particular map i mentioned was volskaya, where the entry point would give no good view to get a mercy hiding behind a wall healing from a good distance (out of graviton surge’s range mind you).
Yes it’s a good turning tool for mercy herself, but in that sense it turned into “why play other supports when i can just play mercy as a solo healer because i can get ult charge that way easier and clutch for a powerhouse team”, could mercy use buffs, absolutely, but mass res is not the answer.
As far as my point of her being “entry level”, i did mention she has capability of high level play and does take thought to play, but it allows things such as less management than zenyatta as far as constantly keeping an eye out for your debuff and healing orbs on top of putting out damage as an example.
As a major point to bring up, Mercy is picked less in high level play, however, she still maintains a ~50% win rate, a 2.40% pick rate at masters, and 8.03% pick rate in bronze (a decline as you rise, dropping most significantly at platinum at 4.86 and then staggering down to 2.40%), she’s still being used. A lower pick rate than Ana but a higher win rate as is, an example of others being Lucio at 4.72% pick rate, Zenyatta at 4.21%, Brig at 3.36%. For those medal fans, she gets gold medals 0.8 times, which is only under Lucio at .9, and Moira at 1.5, she still very much does work.
As a final note on this reply, a counter argument to 2/2/2 not mattering, it matters in a sense of game development and balancing. Again, if hero changes were changed in accordance to the meta, we would see DPS dealing immense damage to counter out GOATS comp instead of doing the damage they deal now, or alternatively, shields would have lowered health, supports and tanks would have lower health or absorption numbers. It isn’t “for fluff and nothing more”, it’s a statement as of how the game is developed. Mercy by all means was made to work with another healer to be able to have an impactful healing situation to assist two tanks, and two dps, she wasn’t designed to heal to sate for 5 tanks, or 4 tanks and 1 dps, or other oddly numbered team comps like any other hero. Again, I still agree she could use some changes, but not mass res.