Albeit this wasn’t a very articulate post he does pose a point: Something I’ve seen happen in numerous other games us that altering the design to accommodate a more ‘casual’ group overall can set an unfortunate precedent, often to the point of alienating a dedicated or core playerbase.
Once the streamlining of features and lowering of a game’s grinding/skill floor/etc begins, it can very quickly become a slippery slope, something which has left many gamers easily frustrated and paranoid about people crying out for things like higher EXP rates, and with good reason. It’s all too easy for the loudest voices of a casual minority to continue to, as the OP said, ‘keep complaining about the grind, just at a higher level’ until there’s nothing left at all.
I’ve seen the whole “give an inch, they’ll take a mile” mindset from loud minorities in every game from Dungeons and Dragons Online to Ultima Online private shards, so I can understand where the OP is coming from, even if his post was a garbled mess.
This isn’t to say, of course, that there isn’t valid criticisms that drag down the grind. Poor enemy AI, a lack of variety in zones, and a mediocre selection of leveling options early on can all make it out to be worse than it actually is, and these issues should be discussed and addressed; just hopefully not at the cost of a lovely rate of progression.