I can tell you that 50 years ago, accounting in parishes was in a simple checkbook format. They didn’t worry about liability, safe environment, asbestos, etc. They had few demands from the diocese. Now-- it’s very different.
In non-profits, it’s the same. You need professional accounting services, you have to file paperwork with the IRS, state, and even local entities. You have to be licensed, have background checks, follow EEOC laws for human resources, you need technology and then you need to protect that from hacking and intrusion. You need facilities, and those need insurance (property and liability).
The list goes on.
It ain’t your grandma’s knitting circle anymore.