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If a person is good he/she can control the power of the strike and still send a message-depending on the context.
Judo people get injured too- a friend of mine who was top ranked in two countries had broken bones
and a partly paralyzed side of the face.
Judo is one of the most injurious sports in existence. Bjj is much kinder to the body. I would only suggest beginning judo to children, teens and sub 25yr adults. Any later and you are very unlikely to get good at it and you will probably hurt yourself badly. Likely to do more harm than good. It is a young person's martial art.