Agree to a certain point
I might be wrong, but I do seem to remember that both Fallouts had a (sort of) scaling system too, in that the random encounters increased in difficulty the further south you moved on the overland map.
But since you weren't really forced to spend all your "outdoor" time in the southern half, you could just move to areas where enemies of a type you felt like bashing were more likely to be encountered. Felt like fighting plants and rats? Stick to Arroyo and surroundings for a while, feel like some power armoured, gauss gun wielding enclave thugs, hang around the area of umm... can't remember the name of the base anymore :">
I don't mind a good challenge at all. It's just that when it gets systematically kept at a certain difficulty level compared to your own abilities, some of the fun disappears.
Of course, if my level 2 vault dweller falls down a pit of hairy deathclaws, some of the fun might disappear too
For me (personal taste stuff), a nice mix would be to give you a chance of "getting back" (wiping the floor with them) at those who made your life miserable in the early part of the game and then use the harder encounters as stumbling blocks between you and special accomplishments, like solving sidequests, discovering that the earth isn't flat, etc.
And since this is Fallout, it ought to be an option to solve at least the critical path and a number of sidestuff without always having to build the ultimate optimised combat machine
Just my 0.25$