Are All Fender Necks Bolt-on?

Are All Fender Necks Bolt-on? Are all Fender necks bolt-on? Fender instruments have almost always used a four-bolt neck attachment design with a tight-fitting joint (the neck “pocket”) and a steel neck plate to distribute the bolt pressure evenly. In the 1970s, several Fender instrument models used a three-bolt design. Why does Fender use bolt-on