I'm sorry but a guy dropped on top of Everest by helicopter, using bottled oxygen has not achieved the same thing as those who've spent weeks/months acclimating and struggling to reach the summit..... and I'd call much of that proccess "Grinding".
One is more more difficult from a technical stand point, while the other (disregarding physical endurance) is more of a measure of perseverance and strength of will. I'd argue that a well balanced pack should have considerable challenges in both categories.
Yeah, I was trying to use not so many words, something I fail miserably at.
To me? Grinding is akin to dropping a barrier in front of you and make you walk a longer way to get to something that you used to get to in one step. If you came in when that one step didn't exist, it's no longer grinding, it's status quo. I don't know a better word for it. (progress?

). If it extends something without providing any value/fun, there doesn't seem to be a point to it in my eyes. ALOT of minecraft ends up in this regard because of the limitation of the engine you're playing with. Some mod makers have taken that to heart and created alot of fun using what they had to work with (AM2, tico, AE, SFM, TE for example).
Taking away the AA from the starter chest wasn't grinding, it was tactically pushing you in a different direction that gave you more options. I felt that SOL was grinding but learned it wasn't really, that it forced me down the path to make different foods. Balancing that with the meals essentially being a food never needing replacing balanced that equation, which directly came about because of frustration with SOL itself.
You see where I'm coming from? Placing a barrier to entry of pneumaticraft which, IMHO needs work, but alot of people have zero issues with, was grinding to me. It had no fun factor (to me), and just blocked you from making the stuff you were used to making already minus that PC interference. Again, iskandar/shane added the cities as a counterbalance to that same issue since I was NOT the only one that felt that way, we spoke up, and voila, compromise. One I can totally live with.
The examples above led to conclusions drawn through conversation right here in this topic. Without this back and forth, I don't think any of them would have been done that way.
Psych 101... To get a rat through a maze, you need to give him/her/it an incentive (cheese). To get a human to move through life, you need to give them incentive (money -> food/shelter -> life). Without the incentive, anarchy, chaos, bakersfield. way over simplification, but there has to be 'had' something, in order to get over that hill and fight the orcs. Unless you're the kind of person that will go over that hill anyways. Me? Still running from vampire pigs and will continue to do so.