Speaking the obvious here, but the expense of running a full schedule or even 50% of one through severe conditions outweighs the intake. Especially when you consider the OJIs from people getting hurt by working in such conditions. Especially since we're in the "fly a 737/A320 6 times a day on one route instead of 2 DC10/L1011 flights" era and the system just can't handle that in severe weather. Also factor in the potential tarmac delay penalties. Better the airlines just shut it down for 24-36hrs and recover it when it makes sense, it's safer, more fair to the customer, and keeps these companies from burning billions in meltdowns which is nice for the profit sharing checks too.

But hey, anything to spin a narrative about how the inexperienced the CAs that cut their teeth flying a turboprop or RJ 6 legs a day through that crap for criminal wages should have to wait/work 2-3 more years to fly an A350 out of LAX....