Thats the choice you make though
As i said the only time a extra mod slot could be handy is at the start of the game for some more armour but after the heist, or even before if you cleared watson first thus getting lvl 15/16, they extra slots are just not needed, thus the vast majority of the game.
I got a lvl 40 char there decked out in all epic just for the looks all with 1 slot to 2 per piece and 1.6k armour that steamrolled every bit of content easily, every character i make does the same which is just wear what they like the look of regardless of quality and im fine, a couple mod slots would make zero difference after a certain point very early in the game
Dont get me wrong Legendary's should never spawn with 0 or 1 mod slot, at minimum Legendarys should have 2 slots
Well, it's true but the fact that the game is poorly balanced isn't a justification for Legendary items to be worst than Epics (it just doesn't make sense).
That's kind of the problem with this game, there's so many things to fix that CDPR is gonna have to make some rework on entire systems because just changing some elements here and there is just not enough.
For example, removing the RNG aspect of the loot fixes the save scum issue but causes some none sensical issue in return where the gears you get from them are always the same, they have to rework the loot system from boxes and the like entierly.
In fact, it's the whole "stat related to your equipment" issue all over again. If you try to make the game more fair, you reduce the player's freedom fashion wise but if you're trying to encourage fashion, then you end up with the ability to save scum and reroll potentially better gear which is technically an exploit.
There's no real solution because they went for a flawed system in the first place.