I asked my Dad his recollections of local authority planning in the 70s and 80s (he was a local authority chief architect) when adding accessible facilities for disabled people became a thing..
At the time, they were VERY clear that these facilities were for people with disabilities, they were not for convenience of the able bodied, they were NOT intended to combine baby change facilities at all.
Unfortunately somewhere between the planning authorities and the laws surrounding actually enforcing things happening, all these modern buildings (anything not historic or listed) and newly planned buildings kicked up a RIGHT fuss about having to make extra space.
Acessible toilets for disabled people are a legal requirement for many business places - baby change facilities are not, those are something provided to 'improve your shopping experience'. Even now, if we took away the legal requirement to provide ATFDP... many businesses would immediately stop providing them because in short, the cripple market spends less money than the parent market.
We.. the cripple market, rely heavily on business and organisations being FORCED to accomodate us. We also have no simple or expedient route to get things changed or laws enforced when facilities do not meet regulations.
We also rely heavily on other people not taking the piss, literally in this case.
All the odds are already heavily stacked against us, it'd be nice if folk could be a smidgen more considerate really!