Upgrade Hell.
In 1995 I started eddiem.com
It was a plain HTML site mostly edited in openoffice. This site has not need backend upgrades to keep working. I sometime make minor edits with a plain text editor.
In 2008 I started Nerdipedia.com, "web-2" was the rage with wikipedia being a poster child. I installed tikiwiki version-1 and built Nerdipedia over the years.
Little did I know I'd see 27 verisions by 2024 or that many upgrades would be problematic.
I didn't know image use would change several times, along with character coding and database format. There were also security bugs which got my web-site hacked and spammers made public contributions impractical.
The software base required to run tikiwiki is complex. It needs PHP and a database engine. Versions need to be compatible - not too old but also not too new.
There are also file permissions and ownership which need to be correct - for linux at least.
There are clear benefits to using a wiki but considering all the problem sticking with HTML may have been easier.
eddie