I thought the same way. But after never seeing any real wear and tear other than a failed thrust washer........ It's not like the belt slips when you're not moving. I haven't noticed a lot of noticeable wear on the 2 I've torn apart. Keep the oil clean and at the proper level and you shouldn't have any problems. Until that washer craps out just after warranty is up.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)