Last physical datacenter my team at the time ran our app in we spent weeks troubleshooting some hardware network driver issues that caused the network to drop. Was an enormous distraction and Dell and VMware support were useless at resolving it for us. I’m glad to have others deal with those low level “oh it must just be your setup” issues.
Anecdotal evidence. I've also seen colleagues spend weeks arguing with AWS support while debugging a weird performance degradation issue, that would have been straight-forward to investigate in a bare metal deployment with full control over everything.
It's not like the cloud is a magical place where no unexpected issues ever happen. Cloud providers can be surprisingly buggy, especially AWS, particularly at scale when you start hitting the implicit scaling limits their docs conveniently forgot to mention.
Each technology has their unique challenges.