Why is cylinder deactivation/variable displacement generally considered so bad for long-term reliability? What are examples of cars/engines that use it with minimal issues?

Asking after discussion with a friend. Many cases of modern reliability issues are blamed on variable displacement, such as the 6.4L HEMI. Is this actually a widespread issue, or is it a case of something that hasn't actually become a big deal...

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Asking after discussion with a friend. Many cases of modern reliability issues are blamed on variable displacement, such as the 6.4L HEMI. Is this actually a widespread issue, or is it a case of something that hasn't actually become a big deal, like arguably auto start-stop? submitted by /u/KSoMA [link] [comments]