I know around 60 persons who have had Covid. Mostly friends of my DD (13-15), unvaccinated at the time, mild (e.g. common cold like) to no symptoms.
However, also have a friend, late 40s male, diabetic, overweight, pre-vaccine, who was on a ventilator and we all were scared he would die. He survived but with some consequences. He says he will always make sure he is up to date on all recommended Covid vaccines and he has made sure not to regain the weight he lost due to Covid.
I also have 2 unvaccinated family members who caught it, one was severely ill in hospital but avoided ventilation. Again, male, similar profile to friend above. His mum, also very overweight but not diabetic, early 70s was ill at home for 1 week and a bit of oxygen, but OK overall.
Many of my DD’s friends, teens, have had it now with hardly any effects and their parents, all vaccinated were fine, at worst, a few days in bed.
I had Covid in 2020 and whilst the initial disease was tiring, it wasn’t that bad but I got long Covid and lots of fatigue and racing heart etc. I get strong side effects every time I have a vaccine but continue to have all recommended vaccines. My 2 boys also had Covid in 2020 and had some consequences (up to 3 months) but have been around a lot of Covid in late 2020 again and all through 2021 and haven’t caught it again. I have another friend who had proper long Covid in 2020 and can still not work properly, needs daily naps. If he goes out with friends in the evening, he is wiped out for days. He is mid 40s.
My DH and DDs seem to be immune to the virus, multiple contacts, never caught it. DH of course is fully vaccinated and boosted.
Vaccination is absolutely key. Nobody knows how badly they will get the virus and the variants can vary quite substantially. I agree with the concept that those up to date with vaccines should not need to isolate. The big question mark is now around those who may be getting it eg a second time and only a PCR is picking it up, with barely any symptoms. How strong is their viral load really? Some of my doctor friends are in this category due to asymptomatic PCR testing.