Might offers a "significant" buff to our stats, which is arguably more relevant for general combat purposes than regen is. In addition, Might gives us scaling mental stats, glory and wisdom specifically, which is not something we can get easily, but is something that is of supreme importance for a ruler we want to be.I honestly think Repose is one of our worst options here; with Progression we already have strong scaling and unlimited potential. We're far better suited by immediate and less conditional power ups.
Besides, arguing about lack of immediate power while picking Feast/Thieves is the very definition of throwing stones inside a glass house lol.