"Ask vs Guess" is one difference between people. Roughly, "it should always be okay to ask, since they can always just say no" vs "saying no is a bit awkward,

"Ask vs Guess" is one difference between people. Roughly, "it should always be okay to ask, since they can always just say no" vs "saying no is a bit awkward, so only ask for things if the answer is going to be yes". In terms of the above: Sure, the person doesn't have to apply the suggestions. But the only reason you'd make a suggestion is if you think something's wrong or could be improved. And suggesting something is wrong if it isn't is awkward. etc.