Any idea what the leverage curve looks like?
Normally if a frame is designed for an air shock (which the spicy comes with), the leverage ratio ramps up at the end of the travel to battle the ramp up in spring stiffness in an air spring.
The normal result of running a coil on a air designed frame is that you end up having to have a firmer ride to avoid bottoming out on good sized hits.
Obviously there are exceptions based on rider, if the rider is light, going coil will help them get full travel. Also if the rider is a mincer, running too much travel for how they use the bike, it will help them obtain that “plush” feeling and get full travel.
I don’t recommend it if you’re heavier than average or do a bit of proper 160mm riding, ie actually riding some proper DH, not just trail centre descents.