Maria,
I have been planting for 40 years - I've heard that, but only from painters, home inspectors and maybe a few others. They will/may tell you it will give you problems with insects, mold, moisture....you name it. I plant right up against the house. I of course make sure that the ground slopes away from the house - otherwise you will have moisture/rain issues. I have Never had problems from clients. The big problem inexperienced folks [and many "pros"] encounter is planting material that will readily outgrow the space. I have no doubts others will disagree - but for me, the 40 years of experience I have with no issues trumps all their arguments against. We may have to prune shrubs that are right on the foundation - but we know that going in.