TerraDave
5ever, or until 2024
He doesn't mean how the entire skill bonus is calculated. He's referring to how in 4e you can have a half-level bonus to attacks, skills, and defenses. Depending on your level it's always the same number. And in Next you can have a proficiency bonus to attacks, skills, and saving throws. Depending on your level it's always the same number.
Only real difference is that in 4e you have a +10 bonus at level 20, whereas in Next you have a +6 bonus at level 20.
The lower proficiency bonus and relatively lower amount of other bonuses do make the math cleaner and quicker to work out. But it's an iteration, not an innovation.
Obviously I know what he is referring to, which is why I referred to in the post, and it is something that 5E does not have. You do not get a level based mod to all checks.
But sure, they are both D20 games. d20+ability mod+other mods. Other mods can be linked to level (BAB...). Its worked like that for a while.