One of the biggest struggles I have had with the development of Eira is in handling potential changes to normal and core mechanics that have been a part of the system since its inception. While not the biggest of these self-contained arguments with myself is that of Hit Dice and how they should be determined.
Traditionally Hit Dice are determined by the player character's class. Thieves get 1d4, fighters get 1d8 and so on. This has been how health has been determined since the beginning but what if your fighter and thief had the same exact background except for that one event that chose their occupational path. Would they not have the same starting health and only have adjustments to that based on their occupation?
I have been flip-flopping on this for a while now and the recently uploaded Pixie Trickster is no exception. As originally conceived Pixies (the race) had 1d6 per level of HD and the Trickster had a HD adjustment of racial HD -1 point, so 1d6-1. Recently I waffled and decided to go back to the traditional method ... only to, a few hours later, regret that decision and change it back again.
I think in the end this is going to be my biggest issue with getting "Lands of Eira" finished, my constant everlasting waffling over details involved in the mechanics.
... Still, it is fun.