Regular Linux distros have 30+ years of history. It's what most of us are used to. Immutable/atomic/transactional OSes are relatively recent hence the relatively low adoption rate.
Also, atomic OSes are, by nature, much harder to tinker with. After all, the goal is to provide the exact same image for all users. As a power user, it's a bit frustrating. As a new user, having a virtually unborkable system is excellent.
If you plan on installing an atomic variant of Fedora, may I suggest uBlue Aurora instead of Fedora Kinoite? It is based on Silverblue/Kinoite but includes by default, among other QOL improvements, the restricted-licence codecs that must be manually installed in official Fedora products.
I've never heard of Linux destroying a Windows partition unless there's a blatant user error.