Archived activities beyond 90 days
I understand that activity logs are archived after 90 days and once they are archived, they will not available thru Smart Lists. - Source: https://nation.marketo.com/docs/DOC-1294 But there is a way to opt out of the archiving.
1-What are the ramifications for opting out, other than the increased time to build smart lists?
2- Will this be retroactive?