Continuation from the days when the drain line was a small diameter pipe, and there wasn't enough water to fill the toilet tank for a good flush. Now drain lines are "normal" (larger diameter) size, so flushing toilet paper down is fine.
It's perfectly fine to flush toilet paper into a septic tank sized properly for the structure, and with a proper drain field.
with a proper drain field! In a nut shell here is a major problem, as most don't have a drain field just a septic, in the barrio the houses are so close there is no way to install a drain field. also no way to drill water wells due to the number of close septic's