you're hardly increasing MaDness. With the standard array you can easily have 8 Str, 16 Dex, 14 Con, 10 Int, 14 Wis and 13 Cha. Other than the swarmkeeper, Rangers don't even really need their Wisdom as none of their good spells use it. Delaying spells with a one level dip is pretty standard, especially if this one level dip ensures you can keep concentrating on those spells later on. Losing dex saves isn't much of a loss either. Aside from the fact that most effects that use dex saves only deal flat damage with no dangerous riders that's easily reduced by Absorb Elements, optimal play assumes that you're using the terrain to give yourself cover, which gives you a large bonus to your dex saving throws. In contrast, con saves buff your concentration, protect you from necrotic and poison damage which are both common and not reduced by absorb elements, and con saves tend to be used for crippling status conditions like being poisoned, blinded, stunned or paralyzed. It's well worth the tradeoff