Oh ho ho ho! What a funny guy! Are you the anti-patchers’ court jester?
First, the game auto-scales, if that slipped by your (obviously not too perceptive) mind. We are level 50 P3 and 4, and generally fight enemies at our own level or down to 5 (not 15) levels below, as given in the patch notes. Sometimes we meet enemies that are above our own levels too, if we venture into such areas (strongholds).
Second, I read the patch notes, and made adjustments accordingly - mainly to improve mana regeneration, since that has become even more important.
But maybe such activity is below the anti-patchers’ court jester.
Third, yes; we play in Adventure mode. That is because we still consider ourselves new to this game (we can’t play every hour of every day) and because my wife has a chronic disease which makes her tire easily if too much happens around her - including on-screen.