Why stop there?
There are so many different schools in our neighborhoods, why don’t we combine them?
There are so many different governtment offices, why don’t we combine them.
There are so many different charaties, why don’t we combine them
There are many yshuls in the neighborhood, why don’t we combine them?
Annd you can go on and on.
The anwer is that they are not all the same and they benefit the tzibbur in different ways, as slight as it may be. If it wrre a matter of saving one of the institutions, it may make sense to combie, but to just say that since they are similar they should combine because there “may” some savings will limit the benfit that you gain by having them separate.