I'm sorry, but what's your argument here? That people who haven't been using an anti-static strap have been damaging their kit in non-demonstrable ways? That's pretty much an argument that's asking someone to prove that something doesn't exist, which is illogical, unscientific and pointless. If you still think it's a valid argument, I'll point it right back at you with a hypothetical argument: Your anti-static strips don't work. You've actually been damaging your kit because you've been using anti-static strips, because they don't work as advertised. Prove me wrong.
At the end of the day, the scientific method revolves around what is observed. Like
@UsandThem , I've been building PCs for a long time and have never used an anti-static strap (I 'liked' his first post because we take the same precautions), over 150 PCs (that's just aside from the countless times I've worked inside desktops and laptops). For DOA components I think I've had one board, one memory module and one HDD, and my computer builds overwhelmingly have lasted 8-12 years and are still working on the day of being replaced.
Furthermore, considering that anti-static wrist straps can be bought incredibly cheaply, if there was any substantial evidence base in favour of their use then suppliers would be pushing them or even throwing them in with a purchase because it would logically save tonnes of time and money to do so. I just picked up the motherboard manual for a board I've recently used, and "use a wrist strap" is not in the electrical safety advice. Also, when having to do the occasional warranty replacement, I have never been asked if I used an anti-static strap when working with internal components.