This has gotten great to read, but............................well yes you can waist time with the 20" and we sometimes do, but when I bit into a 52" 272' tree today for a bridge I would have been pissed with a 20" and so would the boss!
You can do it and anyone experienced with falling can, but why waist the time and energy. At least here, time is money and a guy with a 36" with make half again what the 20" does each day. Yes we still have the big trees. Hell, last week I saw a 14' laying next to it's stump, yes 14 foot biamter, at the cut which was 8 foot up the swell.