There should be other ways to obtain the Field notes.

[Koroem]

I don't want to sound like the devil's advocate here (I am still grinding for the mount as well) but I feel like there are way harder (as in more grindy) mounts to get in game, like the Triceratops/Centurio Tiger from Hunts or the Astrope you get by doing 2000 mentor roulettes.

The patch came out 2 weeks ago and we still have 5 months left until Endwalker comes out. Just take it easy, do a couple Dalriada/Castrum runs a day and you'll have your mounts in a couple months at most.

This is wrong on mutliple levels. The grindy mounts you mentioned have a set end point. They are intended to be long term goals with a clear ending. They have an associated end point. There is a clear start and finish to obtaining these. Do I need to repeat that another way for it to make sense?

Field notes are 100% RNG. There is no guarantee. There is no set end. There is no limit to the amount of time that can be wasted attempting to obtain these. Spending 8 hours a day for 5 months does not guarantee one by Endwalker release. Spending 8 hours a day for 10 months doesn't guarantee one 5 months after Endwalker release. 4 or 5 of these notes have inconsistently high RNG associated with them. They need to be increased to be in line with the other obtainable notes. The intention to make them harder is without merit.

Your logic is flawed and incomplete. RNG of this magnitude should not be acceptable. Gaming has changed over the decades.