But the protection from severe illness is not important if you are young with no comorbidities Your chance of severe illness in that group especially with omicron is very small even if unvaxxed.
However there is quite a noticeable difference n the number of completely asymptomatic cases with omicron with many only being picked up due to workplace, travel or contact testing.
In terms of cost, having flu symptoms whilst not serious enough to put a healthy person in hospital can still leave them unable to work productively a week (sometimes more). Whereas an asymptomatic or slightly symptomatic omicron person can continue to WFH during their 7 day ISO so not necessarily miss any paid work.
YMMV but certainly the few people Ive spoken to who have had omicron said in pre-pandemic days the ill effects were so light that they would have gone to work. This includes one person who is famous for being a man-flu baby when he usually get a cold.