Do Heart-to-Hearts provide some bonus?

Heart-to-Heart events are really good for getting to know characters, yet I'm curious if they provide any other bonuses.

In first Xenoblade Chronicles, H2H improved relationships between characters, increasing their affinity. The sequel does not feature affinity between characters, only affinity between Blade and Driver. Despite this, not all H2Hs are between Blade and Driver. (E.g. there is a Heart-to-Heart between Nia and Morag)

Is there any benefit to Heart-to-Hearts, not counting story and blade skill unlocks

At this time, in XC2, heart to hearts involving only drivers do not affect anything - it's just a bit of comedic relief and character development.

However, heart to hearts between blades and drivers will increase affinity between blade and driver. This can also unlock certain nodes on the affinity tree.