Certainly not an expert here so take this with a grain of salt. I think your fourth paragraph explains and justfies too much. Maybe just state "Flexibility can work in many cases. We would like the accommodations to be more specific". Or, just skip that altogether and go from the current wording to your suggestion (and leave out the "therefore"). I'm assuming that they already know your concerns, right?

Hope this helps.

What I am is good enough, if I would only be it openly. ~Carl Rogers