There is no Hasselblad mirror slap except in the minds of range finger folks and we know that they are all deranged.
https://www.youtube.com/watch?v=CkKcbyh2CrA
The mirror movement is damped out to prevent mirror slap. It did not take Hasselblad fifty years to figure that out.
I don't want to be offensive, even less when you are what I consider one of the best forumers on APUG, but I find some problems with this post. I am assuming you are talking about the Hasselblad 500C and contemporaries of it. :
1 - The machine was designed circa 1956 with some mechanisms borrowed from the 1600F which was designed circa 1949. Most likely the mirror mechanism as well. In those times no SLR had mirror dampening or de-acceleration mechanisms. (See Exacta Varex, for a contemporary example). If i recall correctly, the first SLR to have a clockwork mirror de-accel mechanism was the Canonflex of 1959. Not even the Nikon F had it, and the Nikon F had a production change during the mid 60s to improve the mirror mechanism for lower shock.
2 - As far as i know there are no mirror damping or de-acceleration mechanisms on the 500C. If there were any, it would have been mentioned with great fanfare on the literature, moreover since in those times TLRs were ubiquitous and one of their key advantages was the absence of... vibrations.
3 - The mirror slap/vibration of the 500C is well known, and it's also suggested all over the internet that you should not go below 1/125 for handheld work with it, which suggests strong mirror slap/vibration compared to, say, a camera like the RB67 which posesses an internal mirror deaccelerator and that is routinely used at 1/30 handheld with no problems. For a fitting comparison, the contemporary Mamiya M645 has no such mirror-damping device and the manual explicitely states no to go below 1/125 without a tripod. Hmm...
4 - The video you posted shows the Hasselblad lying flat over a table. So there is no possibility of the camera showing any rocking motion. In other words it is a flawed test. To make a good test, the camera would have had to be placed on a pivot or in a floating stand with accelerometers.
5 - I bought the RB67 the same day I compared it against a 500C side to side. Basically I got to choose which one to buy. The camera vibration felt in my hands when firing the 500C was not only obvious; it was the heaviest i've experienced, even heavier than the Praktisix II medium format SLR and similar to the Kiev 60 SLR which is a very "agricultural" machine. The RB67 was even smoother than some 35mm SLRs. In fact i'm looking at some 8x10" i just made with my RB67 at 1/8 (one eight) shutter speed and the 90mm lens, **handheld**; some of the shots were blurry but some of them are just fine, and that's what I printed. Try that with a Hasselblad.
6 - At least in this city the main users of Hasselblad systems were studio/fashion photographers. Of course, with strobes at 1/500 flash synchronization, the vibration problem doesn't matter at all.