Put a wrench on my Wera 900 chiseldriver bolster like the marketing says, and the tip just rolled over

I had a similar frustration last year when I was working on a heavy steel frame at the garage. I was using those solid brass bits that claim to be rated for massive impact, and I ran into the exact same issue with side loading. I was driving a security bolt, the kind where you really have to twist and push hard, and instead of the bit shearing or breaking, the flange just sort of crumbled sideways under pressure.

It wasn't a snap that failed the tool, it was the fact that the design itself couldn't handle the directional stress of the job, even if the fastener held the weight. I used a brand that is ussually highly rated for industrial stuff, so I was surprised to see the head deformation happen so quickly, maybe after just ten cycles of tightening. It felt like they designed the handle to look tough, but forgot that the point of contact needed to resist that sort of racking.

I ended up moving to a simpler, older bit design from a Japanese tool maker instead. They aren't as flashy or heavily marketed, but the simple geometry seems to distribute the torque across a wider area. It’s less about the marketing claim of being 'heavy-duty' and more about how the actual mechanics hold up when things get rough.

I remember struggling with a diffrent line of impact drivers a few years back. I was trying to pull a seized bolt out of an old cast iron bracket, and the torque required was massive. I thougt the little pointed tips were designed to handle that sudden strain because they were hardened steel. But when I was using a standard 3/8-inch socket and applied maximum leverage, the wrench actualy started slipping on the driver because the hex nut wasn't fully seated, not because the driver broke itself.

It seems like there is a disconnect between what the marketing claims about extreme durability and how the actual tool is intended to be used on-site. They are certainly built robustly for normal tasks, but maybe these specific heavy-duty models are optimized for sheer breaking force rather than the uneven rotational stress that comes from fighting a truly stubborn fastener. That sideways crush of the tip is often the result of applied leverage being too great for the contact point to handle. I've found that for those truly difficult jobs, sometimes swapping to a bit that is slightly larger than the socket allows, or using a pull wrench instead of relying solely on pure rotational torque, is the most reliable way to avoid catastrophic tip failure entirely. If the connection itself isn't perfect, the torque will find a way to defeat the point of the driver.

Gotta push back on the brass bits part of your story. Brass is a soft metal, it's chosen so it deforms before whatever it's touching does. No brass bit is going to survive impact duty, marketed or not, so comparing that failure to a hardened steel chiseldriver going mushy is apples to oranges. The Wera thing is wierd precisely because it's proper tool steel acting like it was never heat treated. I've torqued down on mine with a pipe over the handle plenty of times on rusty deck screws and the tips hold. Now I'm wondering if the OP just got a bad batch.

Funny how the warranty math works. Back in the eighties I dressed my father's chisel tips on the bench grinder every spring, kept a file by the vise for touching up the edges. Nobody expected a screwdriver to outlive you, but you'd fix it yourself and carry on. Now they want photos of the wear pattern like it's a court case. One thing I'd try before tossing the droopy ones. If that steel squishes instead of cracking, it's too soft, and grinding a fresh flat on the tip sometimes gets a couple more years out of it. Won't ever be proper hard again, but it'll drive screws in softwood fine.

Weird question, but where'd you buy the set? I only ask because a mate of mine ordered some online a while back and they turned out to be knockoffs. His tips went soft exactly like that, squished rather than chipped, which sounds like steel that never got heat treated properly. Worth checking if yours have the laser etching and the usual serial stuff on the shaft. If they're genuien then yeah, that warranty reply is a bad look, but if they're fakes the company might not even be the ones who answered your email.