Agree with most of what Gordon has said. Forward bends are done poorly with most rounding the spine instead of hinging from hips. Unfortunately it is the society in which we live. Everyone sitting and not moving for more than 8 hours a day and then coming to yoga for “relief” once a week. For some, it is tight hips that prohibit a good forward bend and others tight hamstrings. Either way, if not done properly, can cause eventual injury a/o exacerbation of poor postural habits. I’ve seen too many teachers not even look at their students during a class, let alone correct or assess ROM.
However, I do incorporate forward bend in most, if not all my classes. That’s not to say that refraining from them is a bad thing. Each of my students knows their ROM in forward bends. As we move into Uttansana or Paschimottanasana, some with good ROM and alignment can beautifully fold forward, others come half way down or less. When their hips stop moving, they stop folding. If they don’t, they are using their back and rounding. For those whose fingers don’t reach the mat, they use a block and keep their legs straight to encourage hamstring lengthening. It is truly an amazing thing to watch a student progress with this and to see the lightbulb suddenly turn on.
But as Gordon said, we live in a forward bending society. Yoga is about balance and allowing that balance to carry through in our everyday living. So for those students, limiting forward bends and working on hamstring lengthening and hip flexibility would move them more toward that balance.