For example, in this one by Lifeline the compass is too big.
Sorry,I have to respectfully disagree with you there. The compass in the RSK is a compromise between size and quality. Many people, particularly those who are long sighted and need glasses may struggle with a button compass. The issue with the compass in this competing kit is not size but but one of poor quality.
Any one with the nous to invest in a decent survival kit should have the brains to purchase a small base-plate compass as well.
The Silva 7, Brunton, Suunto & Recta equivalents cost less than taking the Kid's to McDonalds. If fact for the cost of a week's worth of McD's you could outfit yourself properly.
I'm not quite sure what you are disagreeing about.
Maybe I should have said too big for what I want.
I have good compasses by Suunto and Silva but they are too big to carry all the time.
So yes the button compass is a compromise that favours small size over accuracy.
The reviewer and others say the quality of the lifeline compass is low.
I have not held one so I won't comment on that, but even if the compass in the lifeline was higher quality it would still be too large to fit in my wallet which the button compass does fine.