It is pretty debatable subject and what I find to be an interesting/diverse area. As many bodybuilders/ Power lifters actually concentrate on large muscle group exercises,I don't understand where the focus on isolation comes from? However, even if there is a large focus on isolation, if it is an individual goal to attain better function of a muscle group, a pro-longed or lengthened eccentric contraction of an 'isolated' muscle may be more beneficial and allow growth to take place fairly quickly and well.
Having a full days rest however, does not guarantee complete recovery, so it is up to the individual to be proactive about recovery and follow adequate guidelines. Full body workouts may be too much for a 'newbie' to handle and even pro-long there delayed onset muscle soreness, which could possibly reduce the number of work-outs during the week.
It can only be 'bad' if the person is using bad technique or is not allowing enough recovery time during there work outs which may lead to overcompensation of body parts (Lower back movement for bicep curls). An experienced bodybuilder or lifter would be useful to help assist in mentoring in these areas. So what I think you meant wasn't exactly avoid bodybuilders or even people who spend loads of time in the gym, but perhaps avoid the people who display noticeable body asymmetries (large upper body, poorly developed lower body) and perhaps display too much gym ego (taking selfies in the gym will never be deemed appropriate in my books). You will also find those who are 'jacked', or a competitive body builders don't spend that much time in the gym or do extreme sets, mainly because of the effects of their 'gear' they typically do sets of 3 and reps of 8-12, incorporate compounds movements and complete a sufficient amount of exercises, which I don't think is too taxing or high volume at all. It is the people in the gym environment with high self-esteem issues that will most likely be completing the high-volume/ waste of time exercises.
Compounds are always a good choice, that is something I am not disagreeing with. However, there is an extent to which completing Bench Press, Squats and Pull downs can do to a beginners moral/enthusiasm and contribute to neuromuscular fatigue, which has the potential to turn them off resistance training. Fact's are isolating a muscle group with the right tension stimulates adaption and that is generally enough to keep a person motivated to exercise and stay in the gym.