Some older friends who told me stories about people ruining JIS fasteners on bikes and motorcycles because they assumed it was just a Philips. I think the depth of the point is part of the distinction and it causes the drivers to not have adequate contact with the screw head.
And very very often the owner has tried to take it apart with a Phillips screwdriver and damaged the fasteners as a result.
I have a JIS screwdriver from Vessel that works really well.
Now I'm wondering if they are actually following some other standard like that Japanese one.
Speaking of screwdrivers, anyone else here also have way more screwdrivers than you can explain? I can only remember ever buying a small number of screwdrivers, but I have several times that number. Most of them don't match any of the others in handle shape and color and material, so it isn't like I bought a couple or so sets that I've forgotten buying. I seem to have somehow individually acquired a bunch of screwdrivers.
I'm not now nor have ever been a very DIY person and all my screwing needs are easily met by just a handful of screwdrivers.
I have several full drawers of random screwdrivers.
There may be the occasional unmarked JIS screw though.
Now I use Torx or hex head screws for my personal projects too because they're so much easier to work with once you have some drivers.
Or you're asking for more than the screws are good for. I work in R&D. I've had to do things with fasteners that no one should have to do... and I know this because we redesigned that BS as soon as we could. Phillips has given me plenty of trouble in anything harder than light duty use. Torx and hex have both always been fine. Even if hex is theoretically not very good, somehow it's always good enough in the real world. (The availability of hex ball drivers probably accounts for at least some of this. But now there are Torx ball drivers too!) I've got JIS Phillips, I've got American Phillips, I've got DIN/ISO Phillips, I can tell the difference between them, I know when to use all of them, and I can confidently say I hate 'em all.
I've come across a lot of screws that look like they should take a #1 bit, on account of being so small. But they actually have a #2 head, which can be driven with a #1 driver, with a lot of effort and damage to the screw head.
For such a common tool, this is a pretty major flaw in usability.