I think that's a very valid point. I think people also look for disposable cheap tools (e.g. panel saws) rather than more costly user maintained items.
I'm not sure hand saws are the best example for that. Certainly not for site use anyway, maybe for a joiners workshop but they have all the machines avalible anyway.
The time spent (maybe half an hour) in a Friday afternoon sharpening them adds up to becoming very expensive versus the fiver per saw I pay for the ones that last longer before they are blunt.
Or put it this way. Most carpenters and joiners are pretty tight and don't like spending money if they can avoid it. I don't know a single one that still regularly uses a resharpanable handsaw on site.
We don't do that because we like giving plumbers old handsaws to cut plastic guttering with.
I don't actually like the fact that the economics work out at making disposable Bahco, Spear & Jacksons/ whatever a cheaper bet in the long run as I like things that last for ever but as soon as you count the time spent sharpening them as money (people who always work on an hourly rate can faff about and pretend this isn't a factor but it is to the people they work for) a saw that costs a fiver and lasts a month as first saw and another month as "saw you don't mind cutting timber that's got concrete on or near" makes sense.
Then the college I went to used to cut up old blunt handsaws to make rectangular cabinet scrapers out of the blade so they get a second life.
Also if you use reclaimed timber the noise of a resharpanable handsaw hitting an old embedded nail and breaking a few teeth off is heartbreaking.