Why H/W watchdog is disabled in startup code??

Hello folks,

I was wondering why usually on any startup code the h/w watchdog gets disabled ? Is there any reason for that?

I think it is disbaled because you don't know how much time it takes for your board startup to complete,once you know the time you can reconfigure the HW watchdog timer  to that time and keep it ON in the startup ..is my understanding correct?

Thanks in advance