I've been volunteering with a local political party to help them with their technology decisions, primarily on the web, and... based on this and prior experiences, I've come to the conclusion that agencies do their clients dirty quite often. In some cases it looks borderline intentional, in others I think it's a disconnect between client needs, agency capabilities, communication, and what's ultimately delivered.
It seems weird to say it since so many people rely on it, but wordpress is overkill for so many things. It frustrates so many clients to no end, requires ongoing maintenance that's quite expensive in some cases, and well, it requires an active server handling server-rendering and form submissions and such. The vast majority of clients simply don't need it. They don't even need themes.
This party I'm helping has something like 7 wordpress sites strewn about, all on hosts that cost way too much, some not even updated or maintained at all, sitting on servers that peak at like 40% utilization and otherwise hum along at near-zero utilization beyond what the wordpress isntance requires.
This is a lot of the internet. My experience with these folks has inspired me to build something that would meet their needs, but it's one of these things where... I don't know, if I build it, I doubt anyone would come. But yeah. Most people's needs for the internet are remarkably simple. Even Wix or similar are way, way too much. Yet those basic blogging engines totally miss the mark too. Most of these business users aren't interesting in blogging. They just want a simple home base where they can dump various types of information and let it hang out forever.
I can think of a few products which aim to fix this, but they aren't quite simple enough for the types of people we're describing. The people who know they need stuff online, but don't want to know much about it and don't want to learn much either.