Y'all have made some good points, in that an 18 is fairly common and there's no reason to go as low as a 3. So Let's up the Anti a bit.
If you could get a guaranteed 20 on a stat at lvl 1, and be allowed to raise it up to 30 through ASI's or whatnot, but have to take a 3 in another stat, which stats would you use, what classes could you come up with, remembering what a 3 in a stat means.
For example, a Barbarian or Wizard with a 3 in Wisdom rarely even notices where they are, let alone other people. They have no perception, let alone insight.
If you could get a guaranteed 20 on a stat at lvl 1, and be allowed to raise it up to 30 through ASI's or whatnot, but have to take a 3 in another stat, which stats would you use, what classes could you come up with, remembering what a 3 in a stat means.
For example, a Barbarian or Wizard with a 3 in Wisdom rarely even notices where they are, let alone other people. They have no perception, let alone insight.