And that folks is why a stand alone generation system designed to spec is much more simpler to operate....
DL, while I agree with you that stand-alone systems are much simpler to operate, there are a few advantages of PTO generators that help offset the disadvantage of their complexity.
Just sharing from my own experience, but we used to own a Generac 11K propane stand-alone unit to power our property during outages. A couple seasons ago we sold it and replaced it with a 15K Winco PTO and it's been great for us. While we have some extenuating circumstances due to our relatively remote location, the main reason for our switch to a PTO generator was fuel type and long-term reliability.
After calculating the fuel consumption rate of the 11K propane Generac at ~3 gal./hr., I determined that our 500 lb. tank topped off with 400 gallons of propane could run the Generac for 5.5 days before exhausting the propane supply. While this seems like plenty of time for most people to have their line power restored, we often go without power for 2-3 days during an outage due to our remote location and low priority. During the infamous East Coast ice storm of 1998, we were without power for 16 days. Furthermore, our location prevents fuel trucks from being able to reach our house in anything but the best conditions.
While the fuel consumption rate remains comparable at ~1.5 gal./hr. with our Mahindra 4540 turning the Winco, refueling is a breeze with my 100 gal. pickup-mounted skid tank. Power is typically restored to the fuel stations along the main roads fairly quickly, so I theoretically never have to worry about running out of fuel.
I was also worried about the long-term reliability of the stand-alone unit. A small propane engine that sometimes has to start in below-zero temps and goes straight to operating full-throttle with zero warm-up period doesn't seem like a recipe for longevity to me. Admittedly, restoring power to our home in the middle of the night with the Winco is a much more complicated process. However, having the ability to warm up the tractor and generator before putting them into operation gives me the confidence I need to trust this setup long-term.
Without a doubt it all comes down to your specific needs and priorities. I can imagine that what works for me very likely seems like an over-complicated process to others. Just thought I'd share.