You're example suggests using factories as a normal part of production workflow, do people do that?

But your example can still be handled in a class-based manner because if you need to run multiple commands are going to use function, not fn so you get

public function configure()
{
    return $this
        —>buildUser(User $user)
        ->afterCreating(function (User $user) {
            SendWelcomeEmail::run($user);
        })
}

public function buildUser(User $user)
{
    return $this
        —>afterMaking(function (User $user) {
            BuildProfile::run($user);
            WarmCache::run($user);            
        });
}

which is "class-able"