Changing Cantrips to One Action

[valdis43]

What would be the effect of the following changes:

Cantrips take 1 action to cast.
All spells that roll an attack or cause an enemy to save are considered attacks.
All offensive spells therefore have the MAP.
MAP also applies to spell save DC like attacks (so save DC of 20 goes to 15 then 10).
Nerf electric arc to bring it in line with other cantrips.
In addition to its other effects, quickened spell drops the MAP penalty similar to ranger abilities.

[Grankless]

To clarify, spell attacks already have the attack trait, and if you make all combat spells have the Attack trait, you're going to end up with some weird knock-on effects with various other spells and feats and whatnot.