I don't consider quicklinks weak. Never had one break. Don't think I've ever heard about one breaking even.
Some are considered single-use, some are supposedly reusable. I've reused whichever type I've had on occasion w/o ill effects. The ones consisting of two identical halves are easier to open.
Modern chains use harder alloys to compensate for the sideplates being thinner.
Meaning they tend to deform and chip around the pin hole if a regular pin is being pushed back. Easy to see if you try it out.
It's doable though. I've reused pins several times in a "limp home" kind of spirit. And it has often turned out good enough to last the remaining life of the chain.