It’s hard to say from afar whether he was unhealthy. He certainly was very lean and well-conditioned. He also did suffer some injuries from overtraining. He had a huge impact on bodybuilding, which is remarkable for someone as relatively small as he was.
As for whether it was ideal, aesthetics really are personal. I respect how agile and fast he was, while still being so strong. I’d prefer his build over most competitive bodybuilders, though maybe a classical physique like David over either.