Probably millions of frames and 10s of thousands of shooters over 60-ish years say so, including a ride to the moon as you'll recall, say so. There is a reason that 'Blads were the overwhelming choice of hard shooters working in MF. Not RBs, not Rolleis. not Bronicas, not Mamiyas ... 'Blads. We saw them in fashion, portraits, weddings, architecture, and landscape work for decades.
Anything of this vintage may require a CLA, but this is not a sign of inferior design, it is routine maintenance, no different than changing the oil on your car. I wouldn't buy a car from 1985 without expecting it to require a battery, oil change, tyres, and tuneup.
As I mentioned up thread, I worked in a very large pro rental facility in my youth and watched 'Blads under continuous hard professional use come in- and out. They had no remarkable failure rate unless their were physically abused. This was across probably several dozens of 500 bodies and many, many lenses. I know this because I worked in the repair and maintenance shop. Mostly, the only 'Blads we ever saw were either dropped or rental units that had so many actuations, they were literally worn out from use - they were at end of life.
And this is why they persist today for this sort of shooting. They work, they can be CLAed or fixed if needed, and lenses and accessories are plentiful. There are plenty of newer cameras for which this is not true (looking at you Mamiya 6, Mamiya 7, Fuji GWs, and nowadays, perhaps the RB/RZs etc.). I'd much rather have a 'Blad that needs work than, say, a Rollei of comparable vintage and format.
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