What I see is a difference between those that have been there and done that and know what it takes to do certain things and those that are newer to the business and still see only the positives and not all the realities. If that child in the playpen that is over the 30lb weight limit gets hurt your liability insurance is null and void because you put the child in an unsafe situation - hence the need for specialized equipment meant for special needs children that accounts for a difference between the developmental need and the size/weight need ie a 4 year old that still needs support for sitting up and can't use an exersaucer like my daughter was. We had to adapt and get creative but I would never have trusted some of our "creations" on another person's child due to liability.
There are many forms of supposed discrimination - why do people not whine and cry foul when someone wants to terminate a toddler that cries all the time or won't play alone or won't eat or won't nap or won't give in to our rules of play nicely and yet feel it is ok to whine and cry foul when we decide not to accept (vice accept and later terminate) a child that doesn't fit into our program for other reasons including our own health. Please head the messages on this board about back/knee issues and take them seriously or it is your own family that will suffer in the long run when you can no longer maintain an active lifestyle with your own children or enjoy your own senior years due to damage you did to your body when you were younger.