You and I been playing this game since 2015! It's a long time. Yes, I am averaging 3 levels a day and I'm sure I could level faster if I pushed it harder. Others do, and even on harder difficulty than I play. New players are probably not going to level as fast as us.The issue for me is that for some odd reason every Alpha the time it takes seems to be dwindling. I thought A16 was horribly short on playtime to end game and the first week of 17 i was applauding the slower progression. Until I realized it was all a parlour trick. Its no longer. Go out and kill zeds and you can be level 60 plus by day 21, probably sooner. And the loot it outrageous. In 2 loot rns you can have all you need weapon wise to never have t loot again. Just mine for the bullets.
Its not that we expect more its that we didn't expect the game to get shorter as time went on, with so many removed and streamlined features.
It depends what you consider endgame too. For me endgame is enjoying the fruits of my labors, being maxed out (although I was bored with any single A16 playthrough long before I could max out without cheating) having a huge ornate base full of traps and chests of loot, big farm, etc. Granted that gets boring after a bit for me and then it's time to fresh start, but then that is what makes me hate level grinding to begin with, cause it's always the same thing.
Some people their game doesn't really start for them until they get to that stage; when they've turned survival mode into creative mode by conquest. The "builders" probably are not even close to bored at the same point you and I are.