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Worst PC hardware trends that disappeared
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
I can understand the "lot of effort", but flimsy? Those things were built like a tank. SATA connectors certainly aren't more-durable (not that that normally matters, inside a case).
They also came from a time when hard drives could draw several amps while in use and much more on spin-up. There was a good reason why SCSI drive arrays used to spin each disk up one-by-one.
Molex connectors are good for 10 amps or so, SATA connectors couldn't have handled that amount of current.