We still don't know really much about the virus an

We still don't know really much about the virus and concerning the vaccines our knowledge is more than limited (in what health conditions were the enrolled people / have they tried it under harsh weather conditions and so on??/ the trials didn't take place during winter months). Vaccinated people will still spread the virus and how come people who already had the virus still get reinfected (in some cases with harsher symptoms)? What will happen without masks & without keeping distance?
I hope the vaccines do work, I mean *really* work, but let's not celebrate too early. Covid-19 won't be gone as soon as we hope...
And let's not forget about the increasing number of long haulers the virus is creating, here the vaccines should really have an impact.