I haven't noticed a lot of hints/ominous foreshadowing of tensions roiling in the background that Werther hasn't noticed yet, so it's hard to say at this point. However, I get the feeling that Goethe is getting his Rousseau on and showing that man(Werther) is truly at his happiest when he's at one with nature and the distinction between physical and spiritual love isn't forced into a dichotomy, and it's going to be the pressures of society that cause crushing misery. Werther hasn't fallen to this pressure yet, hence the unmitigated rose-colored goggles.