Either: Only one item: None shown
Or: More than one item or "main product" in prototype: All shown
Which isn't much of an issue in base. Mods, however, add pretty complex recipes. And it doesn't seem to make much sense to require the name to also bear all the possible output items, after all, it doesn't have to include the input - they're on the tooltip.
If we could get an option to show the output items in a icon+name list just like the input items are, that would be really helpful at times.
This would be mitigated by the potential(?) of a recipe version of the tech tree, which would be amazing(!), but until then figuring out these recipes often requires looking up external documentation or consulting something like Foreman.
Examples:
1. In entity view:
2. In crafting menu:
Even though I suggest this as a default-off option, this could contribute to more tooltip clutter. A side suggestion would be allowing us to toggle showing the mod attribution lines off for tooltips.