JWST is observing the infrared only and has a narrow field of view.
Euclid is wide-angle with both visible and infrared capabilities.
Euclid is wide-angle with both visible and infrared capabilities.
A narrow angle is more "zoomed in" so to image a larger structure you'll need a lot of exposures and build a mosaic. It takes a lot longer which means you have to monopolize the instrument for a long time.
If you want to image large structures like galaxy clusters a wide angle telescope is more efficient. Since the lifetimes of telescopes are limited (fuel, coolant, etc) you want to spend that time getting the most data out of the instruments.
Also, frames can just be stitched together if necessary. And Andromeda is larger than the field of vision of Euclid.
A large field of vision just helps you cover a large amount of sky in a reasonable time frame.
For example there were a bunch of articles recently about 'stars disappearing'. That's because we take snapshots of wide ranges of the cosmos every once in a while and compare them. We can use this to figure out the direction and velocity of stars in our own galaxy. And in some cases things appear and disappear that are rather unexpected. You don't get that from narrow angle photos.
Consider comparing a fancy DSLR with a telephoto lens to a night vision security camera. Each does what the other can't, and you deploy them for different tasks.
Especially given that this is a survey mission whose purpose is to image large parts of the sky, it could be entirely plausible to a layman that its angle of view were much wider than 0.7 degrees!