I mostly go barefoot too, and the shoes I have are “barefoot shoes” that have extremely thin soles. But, I still don’t think the individual toes are that important to grip. Sure, the toe pads are important. If you’re moving on the balls of your feet, I’d guess maybe 30% of your weight is in your toes. But, I don’t think I’m getting much contribution to agility from my baby toe being splayed out. If I glued my toes together, I think it wouldn’t hurt my agility much, and it would mean I’m much less likely to catch that individual, fragile baby toe on a corner.