There are various specialty ones - here’s one for parishes: https://4lpi.com/solutions/catholic-church-websites/

Some of these will be built on Wordpress, others custom, but once you notice one for an industry you’ll see it everywhere.

Serious businesses don't go after the "free" concept, but prefer to pay thousands of dollars using CMS that well-known and experienced companies design and implement.

An example of such CMS for dedicated industries would be Adobe Experience Manager [1], previously known as Adobe CQ5.

  [1] https://business.adobe.com/cy_en/products/experience-manager/headless-cms.html

Auto dealerships are a good example. They are run by some local guy who gets a little bit of support from corporate and probably has a low cost marketing agency. But none of them use Wordpress as there are CMSs for the industry. I don’t remember the old ones but the new startupy one is actually awesome but cannot seem to find their company name.