There needs to be an in-game Bestiary with drop lists

[NegativeS]

1: You're forgetting that the market board allows you to buy raw materials.
2: If you max the rank for each of the 6 zones of the expansion (As you'll probably do while farming bicolor gemstones) you'll unlock the ability to buy Every Monster Drop for that expansion in both the major and minor city's bicolor vendors. Remembering the expansion that an item is from is considerably easier than remembering 6 vendors' locations.
3: Doing FATEs is faster than farming monsters for ShB/EW/DT materials, and the price of SB raw materials is absurdly low due to uneven supply and demand as a result of people running Gazelleskin maps a lot more than any other Timeworn Map.

1. At a markup, of course. My sorry self on Dynamis would not dream of paying the high price of raw materials on the MB.

2. Max rank for all zones is a significant investment of time that not everyone would be willing to commit to compared to just going to a zone and killing 50 quickly-respawning mobs, especially if they have other things they'd rather do in the game with their time. Some people have jobs, yeah?

3. This does not account for materials in previous expansions (which still have their uses), and again, there are other things people may want to use their bicolors on. I have probably spent several thousands of bicolors on mats when leveling my DoH jobs.

If the only reason for a Bestiary not existing is "the inconvenience of not having one is based", then I fail to see this argument have much ground.