if you are a high end, world/server first or hit mythic raiding ASAP type person, then you are already putting in a lot of time by choice. If you then choose to chase back, your choice!!! And no one blames you.
If you choose to run that old content every week, good luck to you getting it, if you don't like doing it, DON'T!! And especially don't come here and whine about it. Blizzard give choice n options and we complain about that in the same way people complained about no choice or options. They can't win with everyone, so they try to sit in the middle, in this case by giving people who don't put as much time in the chance for something good, or those that DO put the time in, an additional chance for more gear.
The bottom line is, if you do not want to do old content, don't. If you feel the need because the level you are playing it demands it, either do it and shut up about it as that is your choice, or lower your raiding level commensurate with your play time and desires.
And by claiming people are getting it for no effort shows the level of snowflakeability we are dealing with here. You do not want anyone not doing Mythic to have something at your level because you are the only ones that can have it <throw teddy in corner>. Someone else's hour is as taxing to them as yours, we are all clicking on a mouse and a keyboard. If you have to hike to the top of a mountain whilst playing to complete achievements, then I would back you and say you did more than the next guy scratching his nuts on the couch.
I do not feel the need to do it, I'm a casual raider, I don't need BiS to have fun, just a fun raid team. I do these old raids drunk for a laugh. Therefore, TF is a nicety when it happens, but it is a low chance and doesn't hurt anyone who isn't willingly participating.