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[Loam]

So, I don't know how much of this is already known, but I couldn't find any in-depth info on it.

I wanted to know exactly how the professions allowed to entities affect gameplay, in particular Adventure Mode. Are they more, less, or equally important than allowed items or reactions?
I did two (far from exhaustive) tests: in the first, I removed all professions from the PLAINS entity and started a human adventurer on a pocket-size world with a five-year history.

Spoiler: Results (click to show/hide)

People still generated items on themselves (clothes, weapons)
Items still generated in the world (on the floors of mead halls, etc.)
All citizens are: peasants, doctors, administrators, or soldiers (I did find one hunter, though. Not sure why. EDIT: I've found a few more hunters, so they must remains as well)
All metal objects are made of alloys: no metals obtained straight from ore (iron, copper, silver, etc).

In the second test, I removed all professions from the MOUNTAIN entity and started a fortress (using Play Now! embark settings) on a pocket-size world with a five-year history.

Spoiler: Results (click to show/hide)

Starting seven dwarves are automatically given professions (2 fishery/2 woodworkers/1 miner/1 craftsdwarf/1 stoneworker)
The "Professions" screen of the "v" unit viewer allows only: Mining, Healthcare, Hauling, and Other Jobs
Migrants were either peasants, doctors, or administrators (one peasant had Novice Swordsdwarf skill)
Merchants had all the regular stuff available for trade, but metal objects were only made of alloys.

Conclusions:
- Healthcare professions are unable to be removed (Mining as a labor is enabled, but the profession doesn't seem to show up)
  --apparently hunters can't be removed either, although they show up less often than doctors.
- Professions have no impact on the items generated by the game for merchants/objects in mead halls etc., EXCEPT:
  --professions (either Mining or Furnace Operator, or both, is my guess) determines whether basic ore-metals will show up
  --alloys show up regardless of profession (based on PERMITTED_REACTION only)
  --all other items, materials seem totally based on those allowed in the entity: if jute plants are available to the entity (through the OUTDOOR_FARMING tag or whatever controls that) then objects made of jute fiber will show up, whether or not the entity has Growers, Threshers, Weavers, or Clothiers.

[Loam]

Updated with a few more tests:

All these tests used Pocket worlds, 5-yr histories. Tests 4 - 6 also had Everywhere minerals (to ensure that iron ore was available).
All changes are made to the PLAINS entity.

Test 3:

Spoiler (click to show/hide)

Goal: determine if Miner or Furnace Operator professions are necessary to produce raw metal items ("raw metal" meaning metal obtained straight from ore, like iron, instead of alloys like steel)
3a: removed all professions.
    RESULT: no raw metals showed up.
3b: allowed Miner only
    RESULT: no raw metals showed up.
3c: allowed FO only
    RESULT: raw metals showed up.
CONCLUSION: FO profession is necessary for generating items made from raw metals (but not from alloys).

(BTW, the way I'm testing whether they show up is to start a human adventurer and "l"ook at people and items, to see if any of their stuff is made from raw metals.)

Test 4:

Spoiler (click to show/hide)

Goal: determine if a custom reaction to make raw metals will work without the FO profession enabled.
Procedure:
1. make a custom reaction as so:

Code: [Select]

[REACTION:TEST_REACTION]
[NAME:test reaction]
[BUILDING:SMELTER:NONE]
[REAGENT:A:1:METAL_ORE:IRON]
[PRODUCT:100:4:BAR:NO_SUBTYPE:METAL:IRON][PRODUCT_DIMENSION:150]
[SKILL:SMELT]
[FUEL]
2. Removed all professions (including FO)
    RESULT: Raw metal appears

A follow-up test changed TEST_REACTION's building to CRAFTSMAN, to see if the appearance was hard-coded into the smelter.
    RESULT: Raw metal still appears
CONCLUSION: Custom reactions can provide raw metal w/o Furnace Operator profession.

Test 5:

Spoiler (click to show/hide)

Goal: determine if a custom building using the TEST_REACTION could allow raw metals.
Procedure:
1. Make a custom building (copied from screw press)

Code: [Select]

[BUILDING_WORKSHOP:TEST_BUILDING]
[NAME:Test Building]
[NAME_COLOR:7:0:1]
[DIM:1:1]
[WORK_LOCATION:1:1]
[BUILD_LABOR:MECHANIC]
[BUILD_KEY:CUSTOM_Q]
[BLOCK:1:0]
[TILE:0:1:207]
[COLOR:0:1:0:7:0]
[TILE:1:1:207]
[COLOR:1:1:MAT]
[BUILD_ITEM:2:TRAPPARTS:NONE:NONE:NONE][CAN_USE_ARTIFACT]
2. Set TEST_REACTION's building to TEST_BUILDING
3. Remove all professions (including FO)
    RESULT: raw metal appears
CONCLUSION: custom buildings can allow raw metals to appear in the world

Test 6 was a small one, I just wanted to see whether TEST_REACTION needed a SKILL token to work. It doesn't: the raw metal still appeared.

Also, the large copper dagger adventurers start with is hardcoded to be copper, whether copper is available or not. Same with the copper spear genned on adventurers w/o weapon skill.