acceptable screws
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Flatheads are awful and you know it.
Flatheads are good for a few specific applications that require the head to have flat contact with the surface but not be tall enough to be something else like a hex or torx, but needing a lot of torque. They suck for everything else.
Specific applications like... prying, poking, scraping, and chiseling.
Also handy on horrible cheap raised hex bolts when they get stripped. Dremel a slot and you're done.
There are low profile hex heads that exist for that same purpose though. Pretty much no need nowadays for slotted heads, except at very small scale.