[mAritz]

This is also a simplification.

If the vaccines are creating sterilizing immunity, this might be true. For example the measles vaccine does that.

But for all current SARS-CoV-2 vaccines we have we don't get sterilizing immunity.

So it can still make sense to get vaccinated even if society at large is vaccinated.

[immibis]

What is sterilizing immunity?

[mAritz]

It's when you get immune to getting infected by a virus - antibodies neutralize the virus particles before they can do any harm or meaningfully replicate. All current (and probably future) SARS-CoV-2 vaccines don't do this. Through a combination of several vaccinations and infections the hope is that you get close to sterilizing immunity.