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You say 'extra aggressive Silky', which ones are those? The only demarcation I noticed in their catalogue, aside from the obvious shapes/sizes of the blades' edges, was whether or not it got impulse-hardening...your phrasing makes me wonder if certain silky's are sharper? Would mean they dull quicker I expect? Sharpening seems...less than straightforward (I wonder if my chain-rakes' file is suitable for the teeth on my pruning saw, it's a Stihl am unsure if it's impulse-hardened though....gonna try it!!)
That last part is where you lose me....In essence, for a handsaw to *outperform* a powered saw, your arm would have to be stronger than the battery of powered saw, and while you may be able to generate good force it's pointless to use "a battery's worth of your energy" cutting things. You talk about how with the perfect blade, a pruning-saw becomes so great- I don't disagree, but if we're making a fair comparison we'd have to compare *that same blade* on the pruning-saw & a reciprocating saw, I'll take the battery-power for driving the blade (and a lower level of *my* strength for downward pressure on the unit + maintaining posture), if the same blade is on both units I can't wrap my head around the idea that the unpowered unit could somehow out-perform the powered one...
Good write-up on sawzalls, alongside an angle-grinder it's the most-used tool in my repertoire for sure I've got 4 sawzalls lol (am moving-into arborism from 'general-sevices' so sawzalls are very very familiar to me, would hate not being able to use mine for my '1st pass' in cluttered canopies!)