They push back because they are cheaper and the number of lights replaced is bigger if they use the bluer lights. The number of lights replaced is an easy metric for “progress” achieved.
Recently, a sports field I occasionally drive to, to take pictures upgraded their lights. I asked if they would be animal/insect/bird friendly and they said “Yes”. 6 months later I got an email from them apologising that the quotes they got back for animal friendly lighting had proved unaffordable for them – a charity. Happily they usually go off about 10pm.