sm29 – the whole point of the shidduch system and why it’s so different from ‘dating’ is that the parents find out pretty much everything beforehand. How many dates would it take until the couple decide that actually they are quite interested if they don’t really feel interested in the beginning?
Character traits like temper will only ever emerge after marriage unless you encounter a specific situation during dating that would force the person to show their true colours, since people will usually be on their best behaviour during a date