The last Corsair keyboard I had I smashed in the street in front of my house after sending it in for warranty 2 times for it to only last a couple months then screwed up again. (skipping and repeating key strokes)
Then it most likely was issue of the specific model. I wouldn't discard Corsair just because of one bad model.
E.g, surely you've had a bad pizza in your years. But that doesn't mean that all pizzas are bad, right?
As far as Corsair KBs go;
I'm using Strafe RGB with Cherry MX Silent switches. (Sadly this is now EOL.) Still, 7 years later, it still works fine (bought it Q2 2017).
Even survived one spill on it. Well... for a time at least. The "G" key in the middle of KB doesn't work (i reprogrammed it to another key).
Though, over the years, some individual LEDs under some keys stopped working. E.g red LED under F2 and right Shift, and C key shows orange instead of yellow. But that's minor.
My missus has Strafe RGB MK.II with Cherry MX Silent switches. (Also EOL as of now). Her KB is 5 years old (bought Q3 2019) and i haven't heard any complaints about her KB.
Since my Strafe RGB has the G key issue, i did buy Corsair K100 RGB with Corsair OPX switches as a replacement but i haven't bothered to replace my Strafe RGB out yet.
I like my Strafe RGB, and it's faults i can live with (after all, Strafe RGB was my very 1st mechanical KB that i bought).
But as far as Corsair mice go, those do have model faults.
Sabre RGB wired - after ~1 year of use, double-click registration of left button. (Happened to 3x mice we both used.)
Nightsword RGB wired - after ~1 year of heavy use, middle button (under the scroll wheel) doesn't register. (Happened to 2x mice i used.)
Dark Core RGB Pro wireless - no faults as of yet.
As of why i suggested K70 RGB Pro, is because it has reviewed very well and over the years, is one of the best (if not the best) KB from Corsair. K95 RGB also reviewed well and many like it too. K100 RGB is latest from Corsair but due to it's steep price (i payed €316.50 for mine), it is hard to suggest it.