The fundamental question is: if neutrinos provide a better signal because they overall interact much less than photons (a visible photon coming from the farthes

The fundamental question is: if neutrinos provide a better signal because they overall interact much less than photons (a visible photon coming from the farthest corner of the universe will stop running as soon as it meets my eye; a neutrino can cross a star without noticing), how will you get them to interact with your telescope? That's a big problem for direction detection, too: with a telescope, it's easy to determine which direction the light comes from, as it can cross the front glass but not the surrounding casing. When a neutrino (out of several billions crossing your detector) finally gives a signal, you can't even know whether it's coming from the sky or out of the Earth!