In reply to Davidwi:
> Also I wear my climbing shoes a half size smaller than my normal footwear an I think adding socks would make them too uncomfortable to wear.
Only half a size smaller! I used to be 3.5 sizes below my normal shoes, keen to stand on the smallest footholds. These days I'm a bit more relaxed and mostly 1.5 sizes down, or for indoor bouldering just -1. Though different brands use different sizing and some shoes stretch more than others.
These days it seems like such precision is not needed as much. For indoor use and steep outdoor, like Kalymnos, I think more comfy shoes are a good idea.
Back on the topic of socks it would interesting to see if any pro climbers wear socks. I suspect it's probably none.