@Frequent SLF
Are you absolutely confident that anytime you switch on the seat belt sign there is danger
Frankly, from a safety point of view, it's hardly relevant if there's no danger yet the crew switch on the signs; it just means the signs are on more often than the absolute minimum amount of time. Unless the "false warnings" become so prevalent as to cause a "chicken little" effect, what matters is that warnings be given when needed as much as is possible. A few false alarms are the price you pay for being warned when necessary.