If the damper top mounting point is tearing out of the hoop, the mounting point clearly wasn't made strong enough, this is an engineering failure from the MMC rather than a function of the damper.
Based on personal experience I'd also suggest the leaf springs used by the MMC are the real reason for a lot of these issues, it seems inarguable the leaves were not properly tempered. Mine had gone completely soft in less than 10,000 miles which meant the rear dampers were having to work twice as hard and the loads transferred to damper bushes and mounting points must have been through the roof. When I removed them my AVO dampers were completely shot with zero resistance left in them, in just 6,000 miles the top bushes were also destroyed.
Agreed Dave, the broken upper support shown on the link I posted was of an earlier pattern with support tube welded entirely external to hoop though. Yours I see is of the far superior later design with the support tube welded through the hoop front and back.
I'm guessing my factory 5 link rear relies on a further improvement to a taller hoop formed from heavier gauge tubing , as this accommodates all the suspension loads transmitted by coilovers.
