So really there was no point in quarantining the sick, since, once they realized they were sick, they weren't able to transmit.
Not sure where you got the idea they weren't able to transmit.
Most transmission occurs early but it's still possible to transmit when symptomatic.
I just think it's wishful thinking to believe a recommendation to consider ivermectin for mild or asymptomatic cases resulted in the sharp drop-off in cases India has experienced.
Especially when we've seen almost the exact same curve of cases in other countries that experienced a surge - without ivermectin being involved.