I've never measured but visually Dainite and double leather seem the same thickness.
Certainly no need to protect any part of a Dainite sole - you will not be wearing through the toe section in a hurry! Firstly, the material is extremely hard wearing. Secondly, most of the contact with the ground is made by the 'studs'.
If you want a sleeker, less agricultural look, I believe EG has a thinner rubber sole known as the 'Thames'.