Our reasons:
Airborne Transmission: We are still masking cos Covid-19 is primarily transmitted in aerosols that float some distance inside. The WHO made a huge mistake when they said we mostly smear it into our mouths (or noses) from dirty surfaces. The so-called fomites route where droplets landed within six feet (two meters) of an infected person's mouth or nose, they said. Aerosols at distance inside still coat surfaces, people that far out still breathe it in to get infected.
Risk of Long Covid: We are still masking cos there's 10% to 20% chance of getting Long Covid after you survive each infection. That's cumulative: your second infection increases your over all chances of getting LC, as will your third, fourth .. tenth and so on. That 10-20% is from the WHO.
Risk of sudden death: We are still masking cos there's a chance of a stroke or a heart attack following apparent full recovery from each infection. Covid-19 is a vascular (blood vessels) disease that goes everywhere in the body and leaves lasting damage even after the virus is gone. Hospitals are overrun in the current age because of Covid's effects and not being funded to expand to cover that. Who would want to go to hospital now as a critical patient?
No Compensation for injuries: We are still masking cos hospitals, employers, schools, shops, restaurants, bars won't compensate you for getting infected on their premises (#2, #3 above or risk of death from the infection). Compensation for #2 could easily be lost earnings for the rest of your expected life. Even the person that infected you, isn't liable in most countries. That is even true if they knew they were positive and told you they were not.
No adequate insurance available: We are still masking cos there isn't any insurance that can be purchased to cover a lifetime of lost earnings. There are classes of insurance but they stop payouts after 24 months - per the terms and conditions.
Lack of ventilation standards : We are still masking cos hospitals, employers, schools, shops, restaurants, bars don't meet a published standard on their ventilation and filtration system, let alone show a certificate of inspection toward that. Nor do they have display live CO2 levels (which would be a proxy for risk in lieu of anything else). This could change after the CDC's new guidelines (May 2023)
Virus mutating fast: We are still masking cos medical science has not made a sterilizing vaccine for it, the virus is mutating fast in many parts of the world. This allows it to stay ahead of the imperfect vaccines and boosters we have to date. Repeat infections for people without masks in poorly ventilated/filters places is inevitable.
Source control: We are still masking cos we would not want to pass it on to others, were we infected ourselves and not know it.
When we say masking we mean N95 or equivalent, not the cloth masks we used in mid-2020 when there was nothing else available.
We don't believe in COVID infections as the cost of doing business - a quote from OpenAeros, but worth reiterating