& yet 3 of the 5 magic items in the 5e teaser provide straight numerical bonuses.
But they don't add +6 to hit and damage. They don't add 6 points to your Strength(Except maybe Gauntlets of Ogre Power and they are only useful for people who already put a high number in their strength). They give a small bonus that is nice to have.
The point the designers were making when they said it wasn't about math is that in 3.5e or 4e, a monster at level, let's say 20 would require X to hit. X would be so high that without a +5 weapon, you now needed a 16 to hit instead of a 11 that you required against level 1 monsters when you were level 1. This was a significant disadvantage for the players who didn't have magic items. So acquiring them was simply about math. You needed one to continue to keep the math equal. To continue having that about 50% chance to hit. If you didn't keep it equal, you were likely to die.
Instead of it being a matter of "keeping up with the math", magic items in 5e instead give you a pure advantage. It isn't about math, instead it's about being better at combat. Which, I'm sure you'll say is the exact same thing, however, I believe there's a difference when the bonus from the weapon is not factored into the enemy's ACs.
"The math" they are talking about isn't math in general, but the equations they use to calculate the percent chance of hitting between PCs and monsters from level 1 to the max level.
You may not notice this in any given fight but given that it's twice the margin casinos work off you will certainly notice it over a couple of levels.
And well you should. The point is to give you a benefit. But one you only notice over a couple of levels.
BTW I can live with the +1 difference but would be nervous if some characters got weapons +2 better than others
+3 I think would be my limit. I would expect it to be a really powerful weapon at that. +2 is significantly better, but not better enough that I'm going to panic over it. Though, I think I might just prefer that all weapons were +1. The playtest said that any bonus over +1 was extremely rare. We'll see how this works out in the final version.