branch exchange (BX)

consider this simple code

int main() {
        /* nop */
        return 10;
}

produces this:

It's almost always returning from a function, like ret in some other ISAs like AArch64.

nice read:

• https://developer.arm.com/documentation/dui0379/e/arm-and-thumb-instructions/bx
• https://developer.arm.com/documentation/dui0231/b/arm-instruction-reference/arm-branch-instructions/b-and-bl

why?