There are separate pyramids for Thaumaturgy and Evocation.
Well, that solves the problem with giving focused practitioners specializations. Their pyramids won't be nearly as high as full wizards.
Channeling would give them power/control/offense/defense in one element...
Ritual would give them complexity/control.
Thematic Ritual casters - like demonologists, could have a, potentially, bigger pyramid if you allow sub-specialties: demonic summoning; demonic wards etc...
Focus specializations could go into whichever pyramid, I suppose. I don't necessarily like it, though. Focus items, unlike specializations aren't dependant on which power you take. As far as I know, you can use the focus slots from thaumaturgy and use them to boost your evocation foci. We could expand the Focus limit to make it separate for Thaum/ritual and Channelling/evocation.
So you have a foci limit for each power. You can use foci specializations to boost the limit for each power. In which case you would have it in each pyramid. hmmm....
so your pyramids would be based on
Channeling: power/control/offense/defense in one element and channelling focus specialization (5 specialties)
Ritual: complexity/control and Ritual focus specialization. (3 specialties)
I like that better.
PirateJack beat me to the post, but yeah different pyramids.
My comments are under the assumption that you can not use more than one Focus Item at a time. If you want your casting to have +Power and +Control from foci it needs to be one item. (Or specific group of items, pair of gloves ect.)
I am quite biased on the topic, if my pseudonym isn't an indicator already, I love crafters. It's the human way to succeed. I will agree that frequency bonuses need to go entirely, but I would call Foci Strength and Enchanting Strength fairly balanced on their own. Has anyone tried just removing Frequency?
It wouldn't make a difference. If you look at my Home-brew example, I'd just save all the enchanted item slots I used to boost Power and use them to add frequency to each item. After using my foci and specialties, I'd still have 16 slots. That's 32 uses to spread around. You'd end up with the same problem.