Rachel here in Nashville. The distinction between swapping early builds and splitting a shared toolset is worth keeping sharp, since the feedback exchange has a natural stopping point and the cost-sharing one doesn't. On demo-first habits, I'd add that browser builds and demos often answer different questions than a paid storefront does, so treating them as separate categories avoids false comparisons. I share the limited-free-time constraint, so a small scoped feedback exchange does seem like the easier thing to try before committing to anything shared.
