Also, I wouldn't say never use one source over another since some Trichlor use can be OK if you have some water dilution. However, for sure, it can't be your primary source of chlorine. The Cal-Hypo will increase CH, but does so at a slower proportional rate so water dilution helps more in this case. Basically, with CYA you run into problem certainly at 100 ppm or more though even lower levels can be an issue but handled with a higher FC target (assuming your regs allow that).

So let's say you have 10% water dilution per month. That would be 5600 gallons per month or around 1300 gallons per week which is more than a usual backwash but is possible for intentional dilution for 186 bathers (at 7 gallons per bather as per APSP-11 and other standards) or around 27 bathers per day (think of this as bather-hours per day). The following would be the steady-state levels assuming 2.5 ppm FC per day where around 0.5 ppm FC of that is to handle the bather load (it's about 4 grams chlorine per bather) and 2 ppm FC loss from sunlight and overnight.

Trichlor: (1300/56000)*Level = 7*2.5*0.61 so Level = 460 ppm CYA
Cal-Hypo: (1300/56000)*Level = 7*2.5*0.7 so Level = 528 pp CH
Chlorinating Liquid or Bleach: (1300/56000)*Level = 7*2.5*1.65 = 1244 ppm Salt

So you can see that with sufficient water dilution, the pool is manageable with Cal-Hypo (that was waterbear's point) with only slightly elevated CH levels that should be no problem and can easily be compensated (if necessary) with a lower TA and/or pH. You can also see that using chlorinating liquid or bleach isn't an issue with the salt level either. It's Trichlor that's a problem with its high CYA level. In fact, if you really do have a lot of water dilution, then Cal-Hypo has the benefit of replenishing calcium that you'd otherwise have to replenish with other means unless your fill water had very high CH to begin with.