Because people tune out when there is too much information, and major media doesn’t want to lose advertising dollars. OK, that was just a little too cynical. If the newly-discovered variant is not significantly different than the current and widespread active one, it isn't noted in mainstream media, e.g., the Beta variant. Delta was noted because of higher R value and rate of severe illness.
Remember, the median IQ is 100. That means the number of people with a lower score approaches one half of the entire population.
So they tell only the “important” stories, and they target fifth-grade comprehension.
I haven’t read any whitepapers on COVID-19 since late summer, and at that time, 18 months after it really took off, researchers had identified dozens, of which perhaps a half dozen were named, of which two were in the mainstream media.
Cheers,
Ian