Yea those 10 mythic logs are a real good sample size.Thankfully the dev dont base their nerfing on the feeling of players but based on actual facts.
may be hard numbers will do better:
https://www.warcraftlogs.com/statistics/11
Demon hunters are nowhere the top.
Then if you care to look boss by boss:
https://www.warcraftlogs.com/rankings/11
other classes are actually very close. and again the sample of log visible is really small.
finally, I suggest you look at addons like Detail!, because visually you might think that someone is like far away from the second dps, but when you look at numbers which this addon gives you, it is 5% difference and looks graphically massive. however 5% is nothing, for a boss in mythic, getting a debuff that makes you move away from the boss while you used your CDs can be detrimental etc.
So thanks for the bait thread, but you should be more constructive in the future and post actual numbers, raid type, and logs.