Yes they used CYA back then. 50 years before that is a different story. Just ask some really old people.
Pool equipment isn't a faith-based practice. You don't need to believe in timers. They really do exist! I don't understand the concerns you have. IMO, unless you sit in a lawn chair and watch your pump for the whole 12 hours it is running, you aren't preventing anything. If you have a problem that would burn up your pump upon startup, it will also present itself during any particular 12 hour cycle where you aren't watching.
Evaluate the "determining pump run time" information. Perhaps you can save yourself enough for the few bucks needed for a proper test kit. The best of the kits (TF100 XL) costs less than the typical trip to the pool store and provides way more value.
Specifically which Taylor kit # are you bumming off your friend?