The worst is then trying to buy a replacement.
My main 1/4" socket set is 12pt USA Craftsman I bought around 2002-3 (seriously doesn't feel like that was over 20 years ago.
Lost i think a 7/16" or maybe 10mm. It went 5 or 6 months that I wasn't able to track one down, could only find 6pt at Lowes, Ace, online. It's like they quit making them.
Around 2015ish, when Sears was shutting down I bought a big like 700+ socket set for my shop toolbox so I could stop bringing tools from my garage box.
Well they wouldn't ship to AK, so shipped it to my folks in Maine and they shipped it.
All great until I organize all the sockets and I'm missing ALL the 1/4" drive 12pt and a couple 1/2" drive.
Sears refused to send them, wanted me to send the kit back at my cost, and they no longer had it available, so wouldn't get a replacement. I suspect customer support had zero fucks to give, after all, their jobs were likely done soon.
Sears in town was still open so I suggested refunding the $$ equal to buying the missing ones. Or some sort of credit for them.
Ended up contacting my credit card company and they worked a deal with Sears for partial refund of the value of the missing ones.
Good, but never did get that 12pt set.
I ended finding the missing socket in the engine bay of one of the trucks this spring.