It would be good for people who bought in (higher margin), good for people selling in 6 months (employees), and bad for the company (money on the table).
Don't forget about the underwriters (investment bankers) who will be paid a hefty sum by Pagerduty (despite underpricing the IPO) and who also just got a ton of goodwill from their top trading clients who got those IPO allocations
I don't see how this is better for employees, assuming there is a stable price X, whether you price IPO at X * 0.8 or X * 1.2, by the time 6 months is passed and employees are able to sell, it probably have already converged to X.