As one of those super casual 'forever newbie' players, I personally do not want the shards removed. I do not engage in endgame content, hard modes or other similar activities. Never done arbitrations, steel path, archon hunts and just finally about a month ago was able to feel like I could safely clear over lvl 60 content - IE Zariman or Sanctum missions, without Ivara cheese, Rhino or some other tanky warframe. Players who just like to relax and play warframe probably don't like the Kahl mission grind, but it was nice to have it there when you felt like it, earning shards that you cannot get any other way over a long period of time. At least we were able to engage in the system a little bit. I only just grabbed my second shard and still have not farmed enough stock for the other rewards. Granted I can now run the Cavia bounties for rep but not only is that as some others have mentioned, longer and potentially more tedious than Kahl due to Voca, but not everyone may be ready to farm it. Lower MR players who just made it through TNW/Veilbreaker can at least run Kahl missions with no gear requirements.