i looked into this awhile ago because i noticed the same thing.
i bought a karmin flat iron for just under 200 dollars. i did notice it helped with frizzing. i flat ironed with the karmin and then did a touch up with a different flat iron and noticed the second flat ironed sections got REALLY FRIZZY compared to the karmin sections! my hair didnt revert as much.
i actually got the wrong one and didnt feel like exchanging it (i got pure ceramic and wanted to switch to the ceramic tourmaline but the order had already gone through) so i feel like i cant endorse it fully since i didnt get the product i wanted. i also would NOT recommend buying directly from the karmin website because they never responded to my inquiries and i wasnt able to switch products before it shipped out. **** them.
i had my hair straightened with a FHI and it's pin straight so i might consider that one next. honestly the reason why i cant get salon quality straightness at home is because i dont blowdry, so i would say the flat iron on its own will only get part of the job done - you need a good blowout with a good dryer in order for bouncy silky straight results.
e: after looking at the pictures, i think it was the platform that my hair was straightened with because it had red plates.
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