This is why I liked the 4e approach to skills. The half-level bonus applying to everything means that yes, your "clanker" Paladin (as a rogue-favoring friend of mine says) does actually get better at sneaking, so against weak or particularly unobservant foes she actually CAN learn to sneak around. And then Training is a solid, respectable +5. Early on it's a massive difference, but not an insurmountable one (e.g. take a relevant background with a +2 and find some other feat, item, or power bonus and you'll have covered all or almost all of the gap.) Yes, it does mean the numbers grow large over time, but you need that space in order for things to really feel weighty and DO something. Proficiency early on in 5e is barely noticeable.