I'm not sure I understand your question.
I have two ASUS X99 mobos, both running overclocks since 2014, both still working fine. You'll see numerous posts on these ROG forums from people who have been overclocking their ROG platforms (X99 or older) for a long, long time without reporting mobo VRM issues.
Many people have reported many kinds of defects over the years, problems when the mobos were new, problems which appeared over time.
But many more people have not reported any problems, they are apparently perfectly happy with their perfect mobos.
No manufacturer (like ASUS) will ever volunteer details about design flaws, defect rates, and other problems involving their products, lol. But I think it's safe to say the actual percentage of defective parts is very small - plus the majority of these problems would be immediately evident and would qualify for product return/exchange.
ASUS is well known for using high-quality components and for heavily over-engineering everything they make. There's very good reasons that ASUS mobos consistently set new overclocking records. I think you can be confident that the VRM hardware in any ASUS mobo designed to support extreme overclocking will last for many years without "burning".
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