Speaking for myself, that would be unsatisfying, because now I have to manage 6 spell slots over the course of a whole adventuring day instead of managing just 2 spell slots over the course of about an encounter or two. I don’t like managing resources over a whole adventuring day. That’s much more difficult to make good predictions about, so I end up hoarding my spell slots and never using them. With short rest recovery I only have to evaluate, “do I need to use this limited resource now?” instead of “when over the course of six encounters am I going to have the greatest need to use this limited resource?”