Traditional sources usually provide a single set of recommended levels for all pools. Generally these levels are balanced for plaster pools using trichlor and are less appropriate in other situations. Traditional sources also leave a great deal of confusion about when it is very bad to get out of range vs when it is not that big a deal to get out of range.
It would be nice to have a set of different recommendations for different situations with more information about when the limits are important and when they are "soft". Unfortunately, listing all the special cases tends to cause confusion. There are tricky questions about the balance between giving accurate information and exceeding people's capacity to understand what you are saying. This is particularly troublesome when talking about calcium saturation, which most people have trouble following.
I started listing out all the various special cases for the various levels and I quickly came up with two pages of fairly dense technical information. I can't see any simple way to explain things that comes anywhere close to as simple as the list of upper and lower bounds for each level offered by the traditional sources. For example, on CH even a simple list comes out to something like:
Vinyl, no aeration: 50 to 300, ideal 150
Vinyl, significant aeration: 100 to 300, ideal 150
Fiberglass 100 to 400, ideal 250
Plaster: 200 to 400, ideal depends on CSI balance
High CH fill water: 200 to 1,200, requires careful management of CSI
Overall Limits: 0 to 1,200, depending on CSI balance
It is already too long, and saying "depends on CSI balance" leaves a great deal unsaid.