Rune
Once A Fool
I'm curious about the following statement: "That said, it appears to me that the system will have no problem adjusting to more plentiful proficient saves." Please walk me through how you've determined that.
Because it appears to be easy to adjust the challenge of an encounter more or less on the fly in this edition.
I would hazard to guess that most of us haven't played enough games (especially at mid-to-high levels) to have seen a statistically significant number of saves to make that call, so the justification must be mathematically based. I'm curious to see those numbers.
Or, a third option; it could just be based on instinct and past experience.
Likewise, I don't understand how what you are suggesting is any different than asking a player how they intend to avoid the fireball, then rolling a regular save. If this is intended to provoke player interaction, that can be accomplished without mechanical concerns.
The intent is to provide incentive not to have to ask.
All it's really asking a player to do is figure out how to pigeon-hole their best skill into whatever is happening (you never actually responded to my "Arcana" example above)...
If you will kindly describe how your character is attempting to use his training in Arcana to help resist the assault, I would be happy to adjudicate the situation.