I’ve been doing the same thing with the other guitarist in the band I joined recently. The majority of the songs they’re covering only have 1 guitar part and we’re both concerned with stepping on toes/overplaying, some of the songs were piano based and they worked out their own renditions so it just makes more sense to sit down together and work out the parts. Though for half the set I’ve got a fair amount of freedom to do whatever in a supporting role.
Also, cheers for working out that stuff outside of band practice and making everyone else in the band wait!