Didn't Jesus try to simplify worship with his "where 2 or 3 are gathered, there I am!"  Unlike the Jewish minyan of 10 men, for Jesus just 2-3, male, female!
Lot less overhead. A reason for closing so many church was the YUGE maintenance costs from dwindling collections. Imagine if French government didn't pick up the repair bills of French cathedrals, a bankrupt RC French church.
Separation between sacred & secular space is an imaginary line.  A binary.
Problem today is church have too much empty space, to few folks to fill it up.
Now that's a design project!  How to get 'em in to any space called church?