This argument has been made hundreds of times and I still don't know why... unless you know someone who has found a vaccine it is still uncertain to say how the so called '2nd wave' will happen. Besides, I don't think they want to go through the logistical nightmare with issuing early and then extending and so forthCanada doesn't need to open its borders to give ITAs to CEC candidates. We still need to wait over half a year for applications to be processed. And even after that, the CoPR could just be extended.
If there's an FSW draw this month, all we get is an invitation to apply online, not an invitation to hop on a plane and cross the Canadian border in a few days.