Pasteurised doesn’t equal sterilised. Not sure ofcourse where you live since apparently that matters for this term since some places used pasteurised for what is double pasteurization and thermized for single pasteurization.

I know the pasteurised milk I buy will spoil in a matter of days, even if unopened. The only milk that will stay good unopened for months us UHT.

I hope it at least pleases you to know that in places where UHT milk is the norm, pasteurised milk is more expensive and sometimes simply not available. (I somewhat prefer that flavour)

No. Still needed in smaller business environments if you’re onboarding a new machine.