[gojomo]

It's very likely the UV is an essential trigger of the benefits of sun exposure – either through supporting chemical processes like internal Vitamin-D synthesis, or simply providing the right amount of chaotic 'eustress' that exercises, without overwhelming, essential self-repair mechanisms. So, I'd strongly disagree that "any UV light exposure is causing harm".

Instead, there's a dose-response curve, as with almost everything else, and some moderate level of UV exposure is almost certainly net-beneficial.

Further, getting a light natural tan from the sun itself, without ever becoming uncomfortably burned, is probably more indicative of that optimal level of UV exposure than remaining ultra-pale from absolute avoidance of all sun-UV.