Overall I quite like the sound of the change to tomes and I am looking forward to trying them out however I do think the tome 1 skills are an issue especially tome of justice, but also the other tomes.
What situations do you imagine it is ever a good idea to use justice 1?
The damage is less than axe auto so it is a dps loss on that front and it costs you a page that is far better used on any of the other skills. It made sense before when you were semi-locked into the tome as you needed something as a filler between the more powerful skills. There is no situation where it is not better to simply drop tome and use axe instead and save the page for later.
Personally I would either buff it to be actually useful or make the 1 skill not use a page at all (given camping tome would be worse than camping axe this doesn't seem like it would be such a big deal).
I don't like the mechanist change at all. I would rather you found a better way of nerfing the skill floor as this just sounds like an unnecessary quality of life nerf.
Managing pet AI is already a headache which takes out a lot of the fun factor of having a pet and now you need to manage the pet AI even more and will be punished if you don't (or if the AI decides to do something stupid).
I'm fine with nerfing the skill floor, but nerfing the floor by adding an extra dose of punishing frustration is not the way I would choose.