The first and arguably largest is exactly what you describe. Little sites for small businesses who just want an online presence and maybe to facilitate some light duty business development with a small webshop or forum. These sites are done by fly by night marketers who are also hawking SEO optimization and ads on Facebook and they’ll host your site for the low low price of $100/mo while dodging your phone calls when the godaddy $5/mo plan they are actually hosting your site on shits the bed.
The second, and more influential group of WordPress users, are very large organizations who publish a lot of content and need something that is flexible, reasonably scalable and cheap to hire developers for. Universities love WP because they can setup multisite and give every student in every class a website with some basic plugins and then it’s handsoff. Go look at the logo list for WordPress VIP to see what media organizations are powered by WP. Legit newsrooms run on mostly stock WP backends but with their own designers and some custom publishing workflows.
These two market segments are so far apart though that it creates a lot of division and friction from lots of different angles. Do you cater to the small businesses and just accept that they’ll outgrow the platform someday? Or do you build stuff that makes the big publishers happy because the pay for most of the engineering talent working on the open source project more generally? And all that while maintaining backwards compatibility and somewhat trying to keep up with modern-ish practices (they did adopt React after all).
WordPress is weird and in no way a monoculture is what I guess I’m trying to say.
I use Wordpress for my blog because I stopped caring about maintaining one, and I'm mildly confident wp will be around for 10 more years.
There are basically no notices and the admin sidebar is ~10 obvious entries (home, posts, pages, comments, appearance, settings etc).