Would a telescope that uses Fresnel lenses be more practical than using regular lenses? If we were to make telescopes with Fresnel lenses instead of regular lenses, would it be more practical?  Would this also allow for much bigger telescopes to be made?

Here is an example of the type of lens I am talking about from https://commons.wikimedia.org/wiki/File:Fresnel_lens-1.svg
The main advantage of a Fresnel lens is its reduced mass compared to a normal lens. Its disadvantages include difficulty of manufacture and diffraction from the discontinuities in the aperture, these I suspect are killers given the practicality of the alternatives, reflecting telescopes, to a Fresnel lens refactor.

Diffraction will give reduced contrast in the image, already noticeable in a reflector with partially obstructed aperture, but may well be worse with a Fresnel lens. But the difficulty in manufacture may well be the real limit given the relative ease of manufacturing large mirrors.

While I'm at it; it seems as thought making a achromatic Fresnel multiplet might be quite fiddly.

We might also note where there is no alternative, systems analogous to Fresnel lenses are used. The example I have in mind are grazing incidence x-ray telescopes.