Paranoia.

Top Tboat teams are religious about sail care and they typically only use them for a couple of regatta before switching to fresh. If you choose to go down this path, then I expect you will also remove your main battens before rolling up your main each and every day you've sailed. This "prevent" battens taking a set...though I've not seen this at a significant level with sails rolled up for years with battens in. You should also be taking your jib off your roller furler each day and alternating the rolling direction to reduce pre-curves (Top T teams will roll from the top one day, then roll for mt he bottom the next, switching direction each time).

Me, I leave my spinny in the snuffer between outings, while trailering, storing boat etc.. Main (& Jib) battens stay in unless broken (save for Top main batten..can't roll with it in). Jib gets rolled in whatever direction is easiest for that moment.

I feel there's way too much still to be gained by better sailing skills than these anal-retentative practises.