People know - just not everyone has the time, organization, amount of friends, desire or whatever else is needed to do what you and your friends did. I'm sure it was easy for y'all, but you can't expect that it will be as easy for everyone.
I just figure if you keep the requirements for progression and unlocks attainable for more people, more people will want to play. R30 for some could take dumb long. Not to mention it is more than halfway to cap.
I played very casually, stopping often along the way, not playing for a day or two, switching to other classes, and still got to Rank 25 in a week. If you think that roughly two weeks is too long of an investment to unlock a new class, then I don't even know why you're playing a game that features persistent progression.
Additionally, while Rank 30 is "more than halfway to cap" numerically, it's actually more like 1/5 of the way there in terms of skill points
, which is what actually matters. This means that Rank 30 is actually much, much, closer than you make it out to be. It's not 30/50, it's more like 380,000/1,800,000 (these numbers may be before the adjustment that lowered skill points necessary to rank up, in which case Rank 30 is even easier than I make it out to be).
Finally, the fact that something may be mildly difficult for friendless, disorganized, extremely time constrained individuals is not sufficient reason to make every part of the game take ~15 minutes or less. If you don't have a few hours a week, then a game with persistent progression is simply too much for you to handle.