Let me add on another reason in addition to MephistoRoss why I believe it is. If sorting templates were indeed implemented, people will try them out and some of them will appeal to the audience. Given an option to either build your deck then move cards around while thinking about how the hell they should be ordered or press a button and it will be ordered in a logical fashion, people will choose the latter just because it is no work whatsoever. This would also benefit less experienced players who have no established tactics with regards to card order in the deck.
My guess 3-4 would be plenty. Some ideas that need to be refined:
1. Order by orbs, then by card type (unit, building, spell), then by ascending power costs. [1 orb units] [1 orb buildings] [1 orb spells] [2 orb units] ... Repeat to [4 orb spells]. Inside each bracket cards are arranged based on increasing power costs. - Very useful for inexperienced players, because each new orb unlocks cards from left to right keeping it simple to track the cards.
2. Order by card type (spell, unit, building), then by ascending power costs. [lowest power cost spells-> highest power cost spells] [cheapest units -> most expensive units] [least expensive buildings -> most expensive buildings] - Separates out the card types and unlocks them based on how much power you have. New orbs would just fill in the gaps inside each card type.
3. Order by card type (spell, unit, building), then by orbs, then by ascending power costs. [T1 spells -> T2 -> T3 -> T4 spells] [T1 units -> T4 units] [T1 buildings -> T4 buildings]. Furthermore, each tier is sorted by ascending power costs. - Correct me if I am wrong but this is more or less META for PvP decks, although am not sure about whether buildings or units come 2nd. Feel free to educate me on this topic PvP veterans.
My suggestion then is to allow people to save their preferred settings, a.k.a crafting your own template with a sorting algorithm that the person prefers. Now that would be the ultimate customization route which I would surely use, but that could be too much work for a lot of people.
In my honest opinion having a few templates to choose from would be the easiest and the most practical option that people over time would surely adapt.