The Tank and Healer quota remains the same. So from that point of view, the number of keys done would remain the same. Independently of how many key-holders there are.
What does change for DDs is doing their key or not. Because YOU choose who you invite. You dont wait in the quew like all other DDs.
Think of it this way: You go from being 1 nobody inside a crowd of many DDs hoping to get chosen by a guy in a balcony. To being the guy in the balcony looking at that croud and picking who you want with a finger.
Sure. You wont time all the keys you do. Some PuGs can be annoying. But at-least you play. And you don’t sit in Donorgal queuing for keys. Eventually, you will get all the gear you want. All the score you want.
And most importantly, you will acquire experience on what things to look for when you are recruiting people. How much rio, ilvl, raider IO, wow logs, even the server names… all give information on how likely that person is going to be at timing your key.
Once you know that information, the day you decide to get on a quew you know exactly what people are looking for in a DD. And you will be chosen first over the other 200 plebs in the quew.
Healers and Tanks get to cherry pick what key they go to. Only because its an “on demand” roll. And with the perks of being the “special snowflake” you have extra responsibilities to acheive. Which is a fair trade IMO.
Either way. M+ is a game-mode designed to be played in volume. You have to do many keys. That’s the whole point. Most of the keys you do will be depletes. Most of the keys you do will not give you score at all. And most of the keys you do wont give you any gear either. But if you do many of them, after some weeks you will notice that your Rio went up and your gear is high.
Yes. Very sad to see you swim against the current.
If I may ask: Gear for WHAT exactly?
Just collecting pixel mittens or you intend on improving performance in Raid?
No you dont.
You still get score if you overtime. And most importantly, it shows that you did it on 10.
As for vault, no again. You dont need to time it. You need to complete it. That is the only requirement.