I've been tinkering, fixing, building, modding pc's since 1980, both amateur and professionally as well, my first pc was a Commodore Vic20 with a Toshiba hand-held single speaker tape recorder for a drive and the extra 5KB of ram add-on, so no stranger to pc's here either.
I'll give you that many of the Corsair accessories can be 'iffy' as far as quality goes, and for many years their lower end psu's and even AIO's were not good at all, but that changed when Jon took over psu development. That included cables. Dunno what to say other than the cables are designed to fit only 1 way, they don't fit in reverse unless forced.
I've used multiple Corsair psus over the years, never had any issues other than once with a clients pc, and that was Corsair's fault, the hard plastic tubing on a H100 aio burst conpletely and flooded the psu, which then pretty much destroyed the entire pc. Corsair not only paid for an entire new pc, all interior parts either matched or upgraded but also shipped me a brand new case at no cost, which the old one was not damaged at all, And paid me full price for the time to rebuild. I built the pc, sent them an inventoried price sheet, they had me a check in a week, and that was by snail-mail.
So my view on Corsair is somewhat different than yours, but then again I also don't shop by brand, I shop by model. I prefer Steel Series to Corsair headphones and mice, Logitech to Corsair for keyboards etc. Even (cough) Razer headphones are better than last years Corsair models, and thats saying a Lot.