I agree the immunity to nonmagical weapons is annoying.
Even a Monk unarmed attack counts as a magic weapon from level 6 up.
Maybe for all characters:
• level 1 is nonmagic
• level 5 counts as if a +1 weapon for purposes of overcoming immunity
• level 9 counts as if +2
• level 13 counts as if +3
• level 17 counts as if +4 (+4 weapons dont happen in my campaigns but is here for hypothetical epic adventures)
• level 21 counts as if +5
etcetera.
Of course.
No it doesn't. At least not in the monster math. That's how the random tables turn out if the DM decides to use them, but if the DM never gives out a single magic item over 20 levels, the party will be balanced for the fights the entire way. Magic items are 100% bonus goodness.
Again, this is wrong, per designer words. They said the game doesn't make the assumption that magic items are used.
It's not the math
It's not the math
It's not the math
It's not the math
It's for "wondrous items"
The 5th ed designers designed 5th fighters that by level 20 he or she would have split (unfairly) ~30 permanent magic items between their 3 allies and themselves.
So a level 20 fighter was designed to be wearing at least EIGHT permanent magic items at level 20 in a normal campaign of 5th edition. Four in a low magic campaign. Sixteen in a high magic campaign. And those are the minimums.