Hence their qualifier “rarity.”
The notion that sleep apnea is generally caused by weight needs to die. People also conveniently forget that being woken up multiple times every hour causes weight gain, so often times being overweight is the consequence of sleep apnea rather than the cause.
I started noticing clear symptoms of OSA when my BMI was less than 20 and my VO2Max was around 51. That is to say, I was leaner and fitter than most.
I completely agree that they should screen folks routinely.