Mine are about the same length as yours. I use the open type thimble when I hand quilt so that the nail can poke out. I don't find that they cause any problem one way or the other.
I found if my nails are longer, I rake them across a bar of soap before I go garden. That way the soap is lodged under them instead of dirt. I just hate gloves..I'm trying to train myself to wear the latex gloves to garden in (we had boxes of them left from when DH needed me to nurse him back to health)...so I had plenty. They make my hands sweat tho'