I agree completely that the sliders are a pain. But they are better than nothing.
As far as updating the market: that's a necessary evil. Unfortunately.
Who gets to, among the player base, define what's 'fair'? In this case what is or isn't 'fair' is subjective and it is in the eyes of the beholder. Meaning, what you think is 'fair' others can and have the right to disagree. For example, who is it 'fair' to to under sell animals to? If all the animals are sold at discount prices then it becomes more difficult and time consuming for everyone to generate cc's. It also makes the franchise mode less challenging. Is that 'fair'?
If you put the time and effort in to breed animals that have high gene stats why should the breeder be forced to sell those animals at discount prices? Why don't they deserve to sell their animals for more than animals that have 0 fertility or immunity? Isn't the point of the game, especially the franchise mode, to breed animals with the highest stats possible and to sell their offspring for a profit? If you take that away then you ruin the game, JMO.
I know "fair" is subjective, but honestly. we had not one day in the beta the problem where underpricing animals and ruining the market that way was ever the problem. Always the opposite. Players who had to re-start their franchise almost had no chance to get into the game at all, because the prices exploded. Not until there were (for a short while) enough cash animals. But players bought "cheap" Frontier animals to resell them for more CC and nothing could be done about that. That has nothing to do with a breeder not getting enough for it's work.
Some players, me included, see franchise as a work-together-for-conservation project. As far as I know that was the idea behind it by Frontier. It turnend out to be pure capitalism in the end. And if players like me decide to play the game the way it was IMO intended, and other players buy our Frontier-priced animals to re-sell them for more. then yes, I use the subjective term "not fair".