Most goblins are nasties that can be ignored at a certain point. It's just those few exceptional ones that are significantly better than their brethren who pop up and surprise you. It's a useful tool to have: monsters the players think are set-dressing, but who turn out to actually be threats.
It's a common misconception (which I'm not accusing you of having) that the skill DC for opening a locked door goes up as you level. It doesn't. Any given door has its own level of difficulty to open.
One thing I would like to see them drop is the 3-18 scale for stats.
It makes little sense having say, strength 15, from you have to extrapolate that you have +2 strength. Why not just have "Strength 2"? I understand that it's a sacred cow, but we can probably ditch it by now.
Note the part you quoted, "Part of a skill challenge."
Please read qualifiers.
?
In 1st/2nd Edition, saving throw target numbers decreases as you went up in level. In 3e, save modifiers likewise went up with level.
In all cases, the only defence that didn't automatically go up with level was AC, and even there the party was assumed to be getting better items as they gained levels, effectively increasing their AC.
What 4e has brought to the table is fixed progressions for all defences, and that progression at the same rate for PCs as with their attack bonuses. But the concept of defences improving with level is not new.
But in an absolute sense PCs DO improve. At level 1 the goblin is a challenge to hit and your defenses are barely adequate to defend you against its attacks. Advance to level 5 and said goblin is no longer a big threat, but now you can take on a bugbear and have a good chance of winning. Remove advancing bonuses and you undermine that absolute progression. Now, there might be other ways to achieve it, but there's a good argument for the mechanics being simple and transparent.
One of the more annoying things about AD&D was that the progression wasn't all that transparent. Your AC WOULD improve, or at least it had better if you expect to survive. However you had to depend on either the whim of the dice or the whim of the DM for it to happen. A level 10 fighter in non-magical AC2 plate armor would be a sad puppy.
"False accusations"??I'd like for some of the fans with their nose bent out of shape about the OGL to stop making false accusations of lying, even after they've been repeatedly called out for it, then lying low for awhile, then trying it yet again.
One thing I would like to see them drop is the 3-18 scale for stats.
It makes little sense having say, strength 15, from you have to extrapolate that you have +2 strength. Why not just have "Strength 2"? I understand that it's a sacred cow, but we can probably ditch it by now.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.