I think Piru is right and nobody cares about this rule.
However I belive the rule is a rule and should be kept.
It is not that hard in this case.
Generally speaking tasks should share the same address space, while processes not, and at least for that reason libraries should be reopened personally by each process.
Because people are not respecting such rules it is not possible to introduce memory protection mechanisms to the system.
Cheers for Jose for reminding RKRMs! :pint: