That is why skill expert feat exists. Double proficiency makes a +2 a +4 difference. [...]
In all my games of D&D 5e, I don't think I've ever seen a person take the skill expert feat. It's just not worth it, except for maybe on a high level fighter since they get so many more feats. You lose out on an ASI or one of the much better feats. And even if you do take it (since most campaigns stop around level 10), this gets you an additional +3 or +4 bonus to a skill which is...not really that much. 15-20% better chances of success.
I dislike 5e's system of skill advancement combined with the variance of a d20. There's ~no customization as you level up, which makes leveling up more boring. The bonuses are generally so low, even for level 10+ characters. And you have to take a feat to get proficiency in any new skills. This would be a thing I'd be happy for Larian to change, though I still want some amount of randomness. - Perhaps Dicso Elysium's 2d6 + bonuses for skill checks. I've also seen 2d10 suggested, which is more similar to 1d20 - Some system of improving or getting new skills at level ups. Int mod (minimum 1) skill points to spend every ~4-5 levels, additional skill proficiencies added to classes/feats, something.