The issue in my opinion will be that it will be rusty crews full stop. That is from the gate agent, push back man, etc, every aspect of the operation will need more caution.
Then the ones at the pointy end, both who have not flown for sometime, also as pointed out throw in potential financial stress.
The cabin crew, same deal.
Passengers, stress of maybe not having seen loved ones for sometime, missed a major milestone, antsy, etc.
So despite what some say, I say yes it’s a pressure cooker of unseen proportion. Swiss cheese will no doubt have many more holes in it and no doubt be larger.
What can be done? Yes be professional but also slow down, bugger the OTP.