realistically
To ad to what Mikefunaro, and Zogger talked about. There was a time I use to bounce back, and forth and grab multiple saw's. For falling, limbing etc. When I go to a job or even cutting wood I bring all five. I usually travel a distance, and rule of thumb is to bring all my gear. I showed up for a job being short something once. Never again. But what Mike said I have run into alot of people who consider the 70cc saw's limbing saw's. Around here the timber faller's use the 066-660. I use to argue with a few when I was young, about me grabbing different saw's for limbs etc. They were all raised on the one saw do all plan. Tom me the 70cc saw's arent big, weight is not to much more than a 20, or 24in saw really for the extra power you get. And one of there biggesst seller's for the 70cc saw's, has alway's been gas mileage right? Anyway I dont run 20in saw's much if any anymore, and most of the time I start, and finish a tree with the same saw anymore.
Of the no doubt at least ten million or more dudes who own and use saws in the US..how many are big pacific north west timber faellers (spelt that way on purpose..ha...and I will continue to spell it that way, too, just because I think it's hilarious), or large scale commercial firewood guys anyplace? My guess is, well under 1% are actual bonafide big league professionals. Much higher on this website of course, but out in the wild, in the general population...real real low numbers. And the amount of guys who have to pack in a saw sixteen miles on their back and cut..even lower than that, even among the professionals.
I still think a 70 for limbing is sorta serious overkill for the other 99% of the population who aren't loggers or commercial firewood guys (sorta skipping arborists because they use every size that exists all the time), and most likely you-being included in the "70 is a limbing saw" range- would be leaving behind some really big limbs or pieces of limbs in huge slash piles, or all that good wood is just run through a chipper or just dumped at the dump or bulldozed up and doused with diesel and torched. Am I right? Did I guess right? I know you keep some for your own firewood, but most of what you cut....
I do farm and fenceline cleanup and firewooding, I cut at least twice a week, year round, saplings and branches to some 20 to thirty inch diameter stuff, and keep all my wood for the firewood stash from around wrist size on up always. I love getting big loads of "no splitting required but still decent sized to burn" wood. Sometimes depending on species and quantity, I'll milk it out and cut smaller than that. I try to only leave what I can run over with the field mower the next season, nothing large enough to cause damage to tires or like hydraulic lines or the mower itself, or send stuff flying. So there's no way I would limb with a 70 (don't even own anything that big now, although I need one, and nope, never gonna limb with it if I get one either, unless all my other saws are broke down)
So I think that is where we differ on this. I am not a pro, but more than a weekend warrior suburban guy, cutting is part of my job, but not all my job, so that is the angle I was coming from. I understand you serious full time pros have different perspectives and priorities, it just blew my mind on the whole idea of using a big saw like that for limbing. I guess to you guys "limbing" is taking every single branch most of the time right off at the trunk, and that's it, but to all of us other 99% of the population, limbing is getting a bit more out of that tree to take home or handle, we start out farther on the limbs and work back to the trunk, not just walk down the trunk and whack all the limbs off right there. And for that work, we use smaller saws for the most part, very generally speaking.
And like has been noted here literally hundreds of times, most guys still use at least a "two saw plan", with the most voted for or commented on that I have seen being a combo 50 and a 70 as the most all around practical, with the 50 being the limber.